I am in a math-learning Discord server led by a PhD guy, where everyone works through math books recommended by him, solves the exercises and posts the solutions to get checked. Of course, you can always ask questions.

All of the math is proof-based, so we start with books that teach just that: proof writing, basic logic and set theory. Then you can branch out and learn what you like. Each person goes at their own pacing.

One thing is that you will have to put a lot of effort into learning yourself; there is no silver bullet, regardless of whether you know proofs or not.

If you want to join, you can PM u/CheapViolin on Reddit.