How too get a higher self esteem?

There isn't one way to do it. It's something you have to work at every single day. Just do what makes you feel good and be more forgiving with yourself. If there's something you use to compare yourself to other people (Facebook, Instagram, etc) stop using it or unfollow/unfriend the people that make you feel bad about yourself. Take a day once a week to pamper yourself, work on learning a new language or a skill that'll make you feel more valuable, set realistic goals... Just make sure that you always tell yourself that you ARE worth it, and that there are so many things to worry about besides beauty. Whether you can offer something to the world, whether you can improve the lives of those around you, that's what matters. That's what people will remember about you. Not how you looked.

Sorry that this was long and rambly.