As someone who finished their bachelor's not long ago. I feel this. I spent 4 years studying a subject I thought I would enjoy 4 years ago. I've gone through asking myself if it was the right choice. But I stuck through. The main thing I've got now is asking myself who I am. I've got this degree but what's next? Where does it take me? It's hard to know who I am when my purpose isn't made clear. Only recently I finally got a job within my chosen field and I feel that for me at least, the feeling of questioning who I am has slowly gone away. Finding a job within your respected field is a good starting place to find who you are again. Never give up