Hey gurl,
You sound very unhappy with your life at the moment. Why is it that you feel like you have no friends? Are you too shy to make friends? No one seems to want to be your friend? I hope you find some friends, at least here on PC.
There's no reason for you to feel shame about where you came from. You are perfectly beautiful just the way you are. Why not try asking your adopted parents about your birth parents? Maybe they can tell you something that will help you feel connected to those people that gave you life.
What you describe doing online is very, very dangerous and can only hurt you. Please, be yourself. Respect who that person is and don't exploit yourself.
Sweetheart, I'm 16 and my parents aren't ever letting me have a boyfriend (hey, there's always college, right? lol) so know it could be worse.
Please, believe that someone always cares. It might no seem like it, but I think we all effect more than we think we do. If you take yourself out of the picture, you leave a hole that no one else can fill.
Take care.