I feel like a loser...?

I'm a guy 15 almost 16 going into 11th grade. I'm a little young for my grade too. First of all this is about me never making out with a girl. I'm not a nerd or anything I have a six pack play sports work out kind of often. I have lots of friends I talk to and flirt with a lot of girls all the time. I have only had a few girlfriends and only kissed one of them once. Over the years a lot of girls have liked me and have offered/wanted to make out and stuff but they were below my standards and I'm not shallow and going to use them or go beneath my standards which I think I set too high for myself. I don't view myself as a really hot guy or conceited I just try to look for good qualities in girls that I can have a long meaningful relationship with. A lot of my friends are losing their virginities already and I still haven't made out with a girl. I also keep hearing nice guys finish last.. I feel like a loser and don't know what to do...