I would say go ahead and tell him you like him, and start things at a 'friend' level. Then depending on his intentions you can decide whether to break the news that you are thinking of him as much more than as a 'friend'.
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I would advise you to try and find out if that guy is gay or not. If you just tell him how you feel, and he is straight AND in a foul mood, you might get in trouble. He might start making fun of you in front of others, just to keep up his own 'hetro' image.
So, carefully try to find out if he is 'out of the closet', and if so, approach him in a not too busy location. That way, if he is not interested, he can tell you so without any embarrassment for either of you.

I truely hope things work out. Good fortune! The Good Fortune Buddah is with you..
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Tell him.
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Mithrandir is right. It would be nice if there was no fear of reprisal but there are people out there who actively go out of their way to make it hard for gay, bi and transgender people (which is completely idiotic, I dunno why it bothers other heterosexual people so much but I won't rant)

Try and find out if he is gay or bi. I found these websites:
http://www.xomba.com/how_tell_if_guy_gay_2_tips_tell_if_man_you_like_gay
http://wiki.answers.com/Q/How_can_you_tell_if_someone_is_gay

Kind of useless in that it's mostly common sense but hey it might help a bit. The important emphasis on most sites is that the only way to know for sure is to ask. By asking however, you are potentially placing yourself in a vulnerable position (i.e. he might tell others and they might insult you). So I think you need to differentiate whether this guy can be trusted OR whether you like him so much you want to trust him. This might sound really negative but it has to be said: he's the senior in this case and (at least in my jurisdiction) you're still a minor and possibly inexperience with dating and all that compared to him. Just be certain he can be trusted and he respects you, see what your friends think of him, that's always a good sign.

Secondly, don't rush into anything before you are certain that you are gay or bisexual. It's completely normal during the teenage years for people to become sexually curious. We're suddenly thrown into this world of sex, and when you go to Disneyland you're going to want to try all the roller coasters before you find your favourite... I think the site below has a really great answer on this sexual curiosity. I'm not trying to sway you or anything it's just I don't want you to (worst case scenario!!) rush into something and be labelled as something among your peers that you're not.
http://www.teenhealthfx.com/answers/Sexuality/43756.html

That said, if you're certain of who you are and want to do this and this guy (like any partner in any relationship) is someone you can trust and he respects you, go for it and tell him. Best of luck with it, I hope I helped in some way. :) Let us know how it went!
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Is he a bi too? How much do you like him? If you like him so much and good if he's a bi too, then you should tell him. Who knows he might like you back right? In life, taking risk is okay if really want something. But if you're not really into him, then you can just keep it to yourself.

If he isn't a bi, I think it would cause troubles in your relationship if you'll tell him. He might avoid you or feel conscious when you're around.

Oh well, you're still young and these things shouldn't be rushed. You'll find the perfect partner for you when the right time comes. Just enjoy your youth for now. :)
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sometimes u may like someone so much. its natural and u may express love towards someone in the name of friendship.

one of the complicated definitions in the world is love and friendship.

firstly if a boy says that he likes tom cruise so much, it doesn't mean he is gay.
and a girl saying that she likes Megan fox so much doesn't mean she is lesbi...

u like some 1, then try to get close to that person, become a friend of that person, get to know that one better and then express what u think abt that person.

this approach would be better than jumping into conclusions.

secondly there is nothing wrong in loving a person so much unless u got the hots for that person with a wrong intension.
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I will say keep it to yourself now. a 21 year old is too old for you to date anyway. More than that, you are only 15, a teenager. So i will say to wait a bit longer to define your sexuality. It would be a nice idea to date with some one near to your age.Your life is just beginning. Now is the time to keep up with your studies and other extra curricular activities.
Why don't you wait a bit so that you will be old enough to handle the love and the frustrations it can bring.
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Well, I think that if you know that he's into guys and he knows that you are bi, then by all means go for it! If he's not gay and he doesn't know your bi or even if he knows your bi and is straight then you shouldn't tell him. If you don't know him that well then you should be careful. Certain guys don't like other guys hitting on them. But, if you two are good friends and he knows you're bi then tell him. I don't think it'll hurt to try, but just remember, all guys are different and most get physical when another guy tries to hit on 'em. So make sure that he's ok with being around you.
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