How Can I learn to accept myself?

I'm turning 18 and im 6 feet tall -.- And yea i can be a model , i can do this, i can do that but i feel uncomfortable with myself. Like i don't feel free and i always feel like people are looking at me or laughing at me. So when i'm on the train or outside I have this "attitude face" on b/c it just makes me dislike people. I just hate myself and i may be pretty or whatever but my height is my biggest plummet.