u/Muzinari

I rember finding frases that could make yourself feel better like when you say i am amazing insted of im amazing, it seems to work better, but i need more than that now, is there any self help books that help you feel better qithout relying on your souroundings? O genrally have the innability to feel happiness or joy from my souruoundings,hobbies,friends or anything and it has to be internal? Anything that can help you be internally happy by just saying stuff to yourself?