Any advice on how to increase my self-confidence and/or care less about what people think?

I’ve basically cared way too much about what people think for as long as I can remember. I’ve long known that I seek approval from other people, find my self-worth through others, and my happiness comes from without. I can be brought down by small things dependent on others.

I’m really sick of it. I was in therapy for a year and a half and I had a lot of other things I needed to discuss, so we barely cracked this topic. My therapist tried to instill a sense of my being okay and tried to help me feel good about myself, but it’s such a difficult struggle, especially since my family is nuts and they actively try to make me feel like there is something wrong with me (even though, logically, I know the problems lie with them).

Ultimately, I know I would be SO much happier if I could stop caring what others think and if I could just feel confident in who I am. I’m so tired of this pattern and I want to go through the world not giving a shit.

What advice can you give me?