What can you do to bring your self esteem higher?

Okay..so I have to admit,I have low self esteem.I get teased alot.From girls,boys,groups,it’s so stupid! Even random people I don’t know pick on me! Don’t they know that it hurts? Alot? Anyways,I’m very insecure.How do I make myself feel better about who I am? I want to beat them up..but I’m too scared to.There’s this one guy who always yells my name at lunch and I turn to him and he’d start making fun of me in front of my face and laugh with his friends.Ugh,I know I should ignore them and not care but it really does hurt.I’ve never really felt pretty as much.All my friends say I’m beautiful and pretty but I don’t see it.Can I stop this?