It''s never easy to tell if somone like you. However, there are ways to know. Eye contact, I think, is the best way to tell. Do they try to hold their "gaze" for a few seconds longer than usual? Is there a little smile that accompanies it? Do they look at you when you are not looking? Do they look at you when you are looking? Teasing is another way to tell. Does they incessintly make jokes at your expense, but nothing too harsh? Most importantly you should trust your gut. But there is something to be careful of... know the difference between your gut instinct and wishful thinking. Good luck!
Some guys are different. They can be shy. Some of them gaze at you alot and when they catch you looking at them, They quickly turn away since they don''t want anyone to know they like you. Some of them never even say anything to you.