I don't know enough about you or your interests/personality to give you a definitive answer about what you should do, but I can provide you with some insight (as student who will be applying to psychiatry residency):
1. First and foremost, psychiatry will be a mere sprinkle on the entire sundae of material that you will have to swallow and regurgitate throughout medical school. Yes, you can try to bring it up or add it to the conversation whenever possible, but be prepared for eye rolls. Throughout my first two years, psychiatry was a mere 3 weeks of material.
2. I was committed to psychiatry prior to going to medical school. I knew what I was getting myself into and I was prepared to not be over the moon learning about stuff I didn't love (e.g. OB, pulm, and ENT)...however, just because I didn't love it, didn't mean I wasn't interested. Whenever possible, I tried to apply what I was learning at the current time to things I was passionate about. By trying my best to do the aforementioned (as well as pushing myself to perform at my best during third year in every rotation), I gained an immense appreciation for the interplay between mind, body, and the socioeconomic determinants that influence both. Now, I couldn't imagine studying psychiatry without knowing the foundations of 'proper' medicine.
3. Once you hit the floors, you will deal with mental health issues and socioeconomic disparities in essentially EVERY specialty. I remember during my third year I was assigned to outpatient plastic surgery throughout the year and I was dreading it, I thought "This could not be further away from my true interests...". However, I quickly came to see that a lot of what plastic surgeons do (at least pre/post-op) is reassurance and 'framing'. I think my work in plastics third year was one of my most memorable psych experiences thus far.
Nobody can tell you whether or not you should go to medical school by a single post. However, what I can say is that medical school is what you make it. If you have zero interest in learning anything outside of the mind, well, maybe that should tell you something. And if you only want to be a psychiatrist without also wanting to earn the title of physician, then I would keep far away from medical school (as you will end up being crappy at both, since you can't truly be one without the other).