It must be really hard going through so many thoughts and feelings like this, all at once, but I'd like to tell you that how you are feeling right now is perfectly understandable and normal.
To me, what it seems to be the issue here is that you're trying to fulfil your parent's expectations whilst you haven't figured out what career you want to follow. Not everybody has it figured out what they want to study, from a young age. Some people figure it out years later, and that's absolutely ok.
I'll briefly share my experience with you. When I graduated, and even before, I had no idea what I wanted to study, so I came to Australia for 1 year to get some "living abroad experience", figure out, and go to uni and carry on with my life. I ended up staying and never went to uni. Whilst working, I then found my passion, work-wise, did a TAFE course and continued to thrive in that newfound career, a good 6-7 years after graduating.
My point here is: there is no perfect time and no rule that you must have a degree in order to have a career. If you feel like you don't belong there, it's ok. It may be the case now, or forever.
I'd strongly suggest that you find another psychologist as you shouldn't be leaving there feeling worse than when you entered it.
Also, 2 questions for you to ask yourself:
- Why couldn't you make a career out of being a horse riding teacher?
- Why don't you think you're good enough writing?
There are definitely ways to tune writing into a career, speak to someone at your uni regarding it, they might be able to help you.
But most importantly of all, don't try to please others and forget who you are. Your whole life is ahead of you, there's plenty of time for you to experience things, make mistakes, learn. No time is ever wasted, just valuable lessons learnt.
I wish you all the best.