Also, because I need to think this thought more often, and writing it down helps for that

Dear Self:

Happy is something you achieve, not something you are given. Nobody is going to bring it to you on a plate. It probably wouldn't be satisfying if they did anyways. You build it yourself, and that's not a bad thing.

You deserve it (really! yes you do!) and there is nothing wrong with pursuing it.

Love,
Self