How do I stop feeling guilty about being gay?

I'm 18, and I'm gay. It's just that when I see a guy I get this special feeling that straight guys get with girls. I even have a crush on this gay co-worker who's really sweet and cute. However, I'm Christian and I've been taught that homosexuality is wrong. But I can't understand how it's a sin. I'm not a disgusting and horrible person; I'm a nice guy. I'm not hurting anyone by being gay. I just want a loving relationship with another guy, not s*x. I just want to hold his hand, kiss him, hug him, and cuddle. I'm not being promiscuous or loose. I just can't seem to be attracted to the opposite sex no matter how much I pray and try to force it. Whenever I see my co-worker, I start blushing and get that special feeling. But I feel guilty when I get home because of I what I feel and what I am. I'm also jealous of my straight friends who have no secrets to hide and can feel good about liking someone, while I feel awful about something that I can't help. I truly hate myself right now, not just for the homosexuality. I can't do spectacular in my college science courses so I'm probably not going to get into pharmacy school and I'm probably never going to achieve any form success. But that's only my second biggest concern right now... How do I detach myself from these feelings of guilt, anger, and jealousy?