How can I be more Social?

Growing up through elementary, middle, and junior high taught me mainly about popularity. This is probably every persons dream, but to me, I had a slight taste of it only to be completely taken away by some other guys. I thought I was liked but after I moved from that city, I realized through Facebook how many other people had it all. On Facebook it's "Like this, Comment on that" and all it does is create tensions and jealousies. I see all the girls levatating toward him and everyone drooling over him. I think to myself, Why can't I ever be like that? I had no trouble making friendships with guys, but girls were always my weakness. I was nervous and always shaky. What can I do?