This might get a bit confusing 
I’m currently taking a bachelor of science but I’m so torn on what I want to do. One day I’ll have a clear goal and get excited over planning all the details of this ideal life and persona I’ve created in my head but three days later everything changes and I feel like I’m not even in the right major. I started in fall 2016 with the plan to major in psychology. I was so set on being a doctor but I didn’t take care of myself during the transition to university and I didn’t end up doing very well my first term. The next term I decided to major in biochemistry but dropped out of school in December 2017 after having a full mental breakdown. I went back to school last year (September 2019) and was going to double major in both biochemistry and psychology but I just recently dropped the biochem major to focus on psych thinking I wanted to be a counsellor. Now I want to go into clinical psych. But I still want to be a psychiatrist. Then I feel like I shouldn’t have dropped the biochem major. I feel like everyday I just don’t know what I’m doing at all. I only have two terms I’ve even done well in so I feel like none of my goals are even obtainable because my grades are mostly low. Plus, online classes mostly eliminated my chances to do research. But then I feel like I’m not interested in research whatsoever anyways. 
I’m nervous to talk to my school counsellors or profs about it because I’m pretty certain they’ll tell me to step away and reflect but I’m 23 and I’ve been struggling with this since I was 16, whether I’m in school or not.
How do y’all cope with a really unstable sense of self?