How does someone deal with an "unrequited love" situation?

I'm to the point of feeling very suicidal and severely depressed I can't deal with this infatuating crush anymore. A guy I barely know who works at a GNC at the mall I tend to go to, I really am going crazy about and I would always say & wave Hi to him since I would see him so frequently and he would seem pretty friendly and I finally got the courage to go up to him and talk to him except it was just to ask about a product in the store since I was too afraid to get too personal with him first time speaking to him. I didn't really ask him anything outside of the subject of matter we were speaking about and I would have started out by asking his name but he already wears a name tag so it was kind of difficult since I didn't have anywhere to start off from. I told him I was only trying to see about prices of the particular products I was looking for and that I would come back. I tried going back another day, I just feel however the second time around I didn't really get to talk to him much neither & whether if he's gay or straight he could never be interested in me, all the guys I'm very physically attracted to may never like me. I'm just 'ugly' to them I guess :-( and the one guy I'm into from the GNC store is to me absolutely BEAUTIFUL, he's muscular, tan, very good-looking appearance & face. I'm only into masculine guys so may be the reason for always falling for straight men. I'm only into very straight-acting s. What's my type? "a straight guy" sadly enough. I just don't see any point of me living anymore, I'm never going to ever get the 'gorgeous' guy that I've always wanted and nobody will ever love me anyways. There's just no point to my life what's so ever now. No guy will ever love me.