I'm confused and I'm feeling guilty WHY!?

This guy I liked but he didn't show me any signs of liking me so then I started liking his friend, looking up and down at him and then after a while I started just looking at his eyes and now I feel I can't even look at him as I know hes looking at me all the time I know because I see him in the corner of my eyes, and he has told his friends about me and I just get so nervous when he sits on the other table facing me as I know hes watching I'm usually a confident woman and if a guy even one I like talks to me I'm perfectly fine but when hes not talking and just admiring as it were I get nervous so I've been talking to him online and I'm always the one to say hey or hello.. and he also sits opposite me and if he mishears something I said he would ask his friend and his friend whispers to him what I said (as I heard) anyway since I've stopped looking at him, he hasnt sat near me but he has got up often and walked past me..? =/ What can I do.. I also feel since he seems interested he never says hello first and the first time he tried talking to me it was awkward as he went bright red and I well bit my lip out of habit but maybe he took that the wrong way because since he did try to talk to me he hasnt done it since.