Is psychology worth it?Watch
If you are interested in quant subjects then you could get involved in experimental research, cognitive science, organizational behavior, decision sciences, neuroscience, and so on. Although I am not an expert in this field, psychology research may involve a lot of statistics. Social data science and quantitative psychology are fields with a lot of research opportunities and interests. You could do some search about the possibilities and I hope that more qualified members will reply to you.
Also, because most of psychology is a science about one third of your degree will be studying research methods e.g. how to do experiments/interviews (but learning the theory mainly not actually performing many) and statistics. People are often shocked it is so statistics/science heavy before they join a course.
Then when you graduate you may expect to get a psychology-type job, most students don't and get jobs in other things like marketing, IT, retail whatever.
Medicine is a much better thing if you can get in, it offers a stable career path.