Thank you for the comforting replies everyone.
As far as my degree plan goes, I'm on track and I'll be able to get all my courses done in 4 years with room to take other classes of interest (barring any other changes of heart). I think I'm just frustrated because I've been used to knowing exactly what I wanted to do and how to get there. With the PA route, I had to get a ton of patient care experience, shadow PA's, keep my grades up, and I was set. I'm not saying that those are small feats by any means, but they're more, for lack of a better word, straightforward. Research is a whole different ballgame where you have to be innovative and up to date as you're responsible for producing new knowledge. These are some things I definitely need to get exposed to. Then if I do choose to go the research route, there's the issue of having enough experience/publications to get into a good graduate program which I know takes a lot of time. For those reasons, I have been feeling behind.
Typing all this up, I do feel that I'm overreacting a bit, haha. I think you all, particularly daniele, hit the nail on the head when you said that I should just focus more on finding other research opportunities and less on what I could have done differently in the past.