Am I doing it wrong or am i unlucky?

Well I'm about to start my second year of college and last year was a compete **** when it come to dating or girls in the fact. I had one girl who was cool and we kiss on the first date but after that she didn't want to talk to me anymore and I feel like that I was used to get over her ex bf, I had another girl who went out of her way just to meet me(like going to my dorm room in middle of the night and I wasn't there) we hang out for like a month and then she just turn to a compete a** and told me not to talk to her anymore( which i didnt do anything to upset her) and lastly I been trying to talk to girls to see if I can a get their number but usually I get shut down(and they don't have bf) so my question is that if I'm doing anything wrong or am I just that unlucky?

Ps also I am a nice guy so I'm think that the nice guy do finish last I hope that not true