I'm bad with people.

I am 15 years old. I'm pretty bad with meeting new people and forming new relationships and even when I do make new friends it is very difficult for me to open up to them about my life and feelings. I've been trying to work on this but I've been finding it very difficult to meet people I relate to on any level. I would like some advice on this so that the next time I meet someone I relate to I don't screw it up.