In recent times, I have been studying mathematics (topics related to mathematical logic, more specifically) independently and I feel a great deal of passion about it. However, although I have made peace with the fact that it's a lonely endeavor and my motivation is enough to carry on, I have also become preoccupied with the veracity and quality of my learning; basically, I'm worried about misinterpreting things I read and/or that my proofs are fallacious.
For example, currently I'm reading  and working on the exercises with great pleasure (these are some of my notes). I also worked through some of  (again, some of my notes). I tried to contact several professors in my area asking for advice and available programs, but I never got a reply from them. Unfortunately I do not have a university degree and my current life situation doesn't allow me enrolling in one.
How can one make progress as an independent student and gain the additional confidence/reassurance that could be attained, perhaps, with the help of an advisor, a teacher or fellow students?
 Shoenfield, J.R. Mathematical Logic. Reading, Mass., Addison-Wesley Pub. Co (1967)
 Knuth, D. E.: The Art of Computer Programming, Volume 4, Fascicle 6: Satisfiability. Pearson Education (US) (2015)