You can self learn math to a certain point but eventually you will reach a subject where its introductory text requires a context not written plainly. This is e

You can self learn math to a certain point but eventually you will reach a subject where its introductory text requires a context not written plainly. This is easily observable in research. Researchers do not write papers with the goal that everyone understand their work but rather that those in their field understand so the work can be verified. You are then stuck either having to derive the mathematical principles you need or you will have to ask others for help.