I get nervous and quiet around strangers or people that i know?

I think you need to get to know yourself first. Don't be afraid to be alone for some time. Then after you've reached a level when you don't care what others think anymore--you will attract like-minded people or maybe you will have enough courage to say hi first. We humans forget that we're not the same. You may be in the middle of growing and that is normal. It seems like you're lacking direction too. Only person who can lead you is yourself and with the guidance of God. (only if you believe in him. lol.) But anyways. I hope you get more answers. And it's not your job persuade people to like you..unless you're going into sales. :)lol.