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When people listen to each other intently, they subconsciously imitate each other's body language. The next time you're engaged in a good conversation with a guy you think is interested in you, do specific things like cross your arms, put a hand under your chin, or lean forward. If he follows suit, it means he's focused on you. The next time you and the guy you think is interested in you hang out together, try sitting closer to him than you normally would. Then, when it feels appropriate, lean in toward him. If he moves away, chances are he's not interested in you. However, if he gives little to no reaction, or if he repeats the gesture, he very well may have a thing for you. If you feel comfortable doing so, try reaching your arm out around his shoulder. If your previous advances went well, try to break the touch barrier by letting your hand "accidentally" rub up against his. If he moves his hand out of the way quickly, or if he seems put off by the action, then he probably isn't interested in you. If he doesn't withdraw his hand immediately, there's a good chance he likes you as more than a friend. If you're too nervous to touch his hand, try working up to it by touching his shoulder or arm instead. If a guy responds well to all your romantic advances, ask him directly if he likes you. Then, give him a chance to think it over. If he is genuinely interested in you, see if he wants to go on a date. If he's not interested in you, or if he's not ready for something deeper, apologize for misreading the signs and let him know that you're fine just being friends. When asking the initial question, preface it by stating that you're picking up romantic hints. For example, you could say, "I'm getting a vibe from you, and I wonder if I'm reading it right. Are we just friends, or is there something more here?" If the guy says he isn't interested, give him some personal space. Things may feel awkward for a little while, but your relationship will eventually return to normal.
Make specific motions to see if he mimics you. Sit closer to him to see if he is comfortable with it. Brush your hand against his to break the touch barrier. Ask if he's interested in you.