Need and want self improvement

Guys😭 my self-evident and confident is really low. Like i want to make lot's of friend and want to be nice to everyone so that everyone likes me, but it doesn't work really well.

I actually agree that my personality is not good. As an example, i am always jealous of others when they are getting pretty or loosing weight. I want them to be unhappy so that i think im better than them. I know that is so mean and I try to fix it, but don't work well as i try to. I don't like people who are prettier or better than me. What's wrong with me and please help me to fix this huge problem😢