<human>: Condense the text into a few key points

I feel like a shitty person, but I have a great girlfriend who I've been going out with for almost 2 years now. I was very much a forever alone beforehand, I only had one real girlfriend before that and that relationship lasted barely 3 months. We are in the same class working on a medical degree. Before medical school, girls would barely look at me but now I'm getting a few girls flirting with me, gorgeous girls that I would kill for back when I was forever alone. My girlfriend is very sweet, kind, and my family loves her. Her sex drive isn't as high as mine but that doesn't really get in the way much. But resisting these other girls fucking hurts, I don't know what to make of that. 

Thinking that way makes me fear that deep down somewhere I don't want to be with her. On the other hand I know it's just physical pleasure I'm missing out on with these other girls. I really wish I had been able to explore more when I was younger, and now I'm faced with missing out on that or losing my girlfriend, and I don't think I could find another girl like her.
<bot>: Former forever aloner finally got a girlfriend, but now a bunch of girls are flirting and I'm not sure how to handle it