<human>: Can you succinctly summarize the text in 1-3 sentences?

So, before we really start, I'm a 20 year old male. I'm certain of my attraction to women, long list of reasons. Anyways;

For the past 3 years, after my first real relationship (nearly a year long, end of grade 12 kind of deal) I have had literally no sex drive. Both girls I've been with (first was six months, second was a year and a couple) have left me because of my lack of sex drive. More recently even setting herself (18f) up with another guy before leaving me, making me feel even more damaged in the process. 

I've tried bringing girls back to my apartment (I live with 2 roommates) to see if I could jumpstart my sexual desire, but I lose interest literally in the middle of sex and pretend to finish in order to get to stop. I feel awful afterwards, but I'll do this or get intoxicated every other night. It's either that or fight off urges to hurt myself. I'm extremely lost.

I've lost all of my close friends because of the girl who left me anyways (she was literally my best friend; figured we were in it for the long haul etc etc) and I haven't gotten along with my family in years. Now because of the multiple stunts my ex pulled and my lack of relationship with my family, I have no one to ask. So here it is Reddit; how do I fix this? Is there something definitively wrong with me? Would counselling or therapy do anything?
<bot>: I can't get into sex, and I've lost multiple relationships to this. What do I do to resolve this?