Depressed: Did I Make A Mistake?

How old are you, if I may ask?

How would you describe your self-confidence levels?

well, it sounds like you've been thinking alot like you said, i know when i think too much or overthink something that too can happen, am told i think too much and that is where our problem lies true. But can you change that, probably not it is part of you. What can you do though? Well, still regret not taking the class, then go sign up for it again and take it this time, I say you will never know unless you try. Its okay if you're still not sure which way to go, I've taken lots of classes just to see if it fits me better, I would like it or find it isn't really for me. Or like some I know, just end up doing both after all, two completely different subjects. And others actually graduate, find they hate it later while working and go back to do another different degree, and that too is okay, because what matters is how do you feel about it? If you are unhappy how it ended, the good thing is YOU can ALWAYS change it, that goes for any decision you make, try it if it doesn't work for you then do something else, don't kill yourself over it day after day feeling miserable, it will not get you anywhere. Of course speaking from personal experience. About parents, tell them what you want them to know, rather correct them, and tell them how it makes you feel when they don't acknowledge you correctly. They too are human, make mistakes just like us, and am sure they want nothing but your complete happiness in anything you do no matter what or how you end up, just be happy with it. Good luck to you.