Tips on how to love yourself/be happier?

Recently I’ve been extremely down. All of high school I’ve felt alone. I lost more and more friends each year and now that I graduate in a month, the reality is that I need to be there for myself. I want to be happier, but I pick myself a part in the mirror everyday. I have a cynical attitude towards everything and I’m burnt out. I want to go on a self love journey, I don’t want to feel bad about eating or constantly feel the need to say mean things to myself. I just don’t know where to start.
Tips on how to love yourself/be happier?
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