Self-regulation doesn't necessarily mean that you are self-taught. You may enlist the help of one or even several teachers and tutors to better learn math skills. Self-regulation means that you take the steps you need to take between math lessons to make sure you are accomplishing your goals. The first part of developing a self-regulated approach to math is to begin developing good habits. Some important habits include keeping your math materials organized so that you can easily access notes from previous things you've learned, spending time thinking through and reflecting on new information to make sure you understand it and setting clear goals for your math learning.
One important mathematical strategy that anyone taking an active role in the pursuit of learning can use is to connect each new concept to the concepts that have come before. For example, learning multiplication is really just an extension of addition. The self-regulated math student, when introduced to multiplication, will take the time to think about the concept and eventually realize that 12 x 4 is the same as 12+12+12+12. Thinking about a new concept in terms of one that you have already mastered will increase how quickly you are able to learn new math techniques.
Some people learn best by reading. Others need a verbal explanation. Still others learn best when new information is presented visually. And others may need a combination of input to grasp a new concept quickly. Think about how you like to learn, and then use that information to help you with your math studies. If you learn best by reading, working your way through a textbook might work fine for you. If you learn through explanation, a computer math program may be a better fit. If you learn through visual example, make sure you take any concepts you are presented with and draw them out on paper.
A simple strategy that can be applied to every math problem is to first make sure you understand the problem, devise a way to solve it, implement your plan and check your work. No matter what way you find is easiest for solving a problem, this four-step method can serve you well. In some cases, for concepts you already have a solid grasp of, the first two steps will be almost instantaneous. For concepts you are still mastering, the process may take longer.