How can I change my self?

I don't know what to do, I'm always at home and I rarely go out, when I got out I don't talk to anyone so it's hard for me to meet guys in real life. It's easy for me to meet online guys and like them and when I start feelings more toward me and they say like me, when my feelings start to develop they reject me and make it seems like they used me and they never liked me. Every time it happens like that and I blame my self. Am I stupid? Do I believe guys fast? Am I naiive? I don't know, I just want feel loved but I end up feeling stupid. I'm tired of moving on every time, it hurts a lot. Should I start to find guys in real life? Should I stop trusting online guys and believe that they are liars? Should I start to like a same gender? Should I not be stupid and know how to make him to like me instead of the opposite? Should I give up and live my life? How can I improve my life and social life? Is it better if I focus on my self? I'm really full from the inside and I feel like I will blow up.