At the stage you're at now, it would be easier to become a clinical psychologist. As others have said, psychiatry requires a degree in medicine so you'd have to finish your psychology degree and then do a graduate medicine course. Clinical psychologists are required to complete a doctorate after their undergrad but it wouldn't contain vast topics that are unrelated to what you want to do. That said, both routes are quite competitive but if you work hard and have the passion then there's no reason why you can't succeed.