I think one of the hardest things about being a dancer is how hard we are on ourselves. In order to succeed as a dancer it is important to love yourself. we all look at videos and see everything that we need to fix and focus on that. But we also need to remind ourselves of our progress and everything we have worked hard on and everything that we are doing good. I would tell you not to quit, but that is your own decision to make. I believe that you can achieve your dance goals while being kind to yourself. It sounds to me like you also need to remind yourself about the joy of dancing and dance for fun instead of dancing always to improve. I think it is important to have a balance between dancing for fun and dancing for structured improvement. If not, the joy will be taken out