the title says everything. I'm studying pure-mathematics as a freshman but I also like to understand subjects like GR and QM. I have a good understanding of Newtonian mechanics and the classic theory of electrodynamics but I have found quantum mechanics and general relativity so confusing and unintuitive. SR is way easier though, but I can't fully understand it in a level that I can say I've mastered it like Newtonian mechanics. Can a pure mathematician study the TP courses on his/her own and be a professional theoretical physicist? If yes, what courses should he/she study on his/her own?