Losing interest in everything?

Hello!

I am a high school senior planning on going to college this fall. I was a very enthusiastic student until I was recently diagnosed with depression. After the diagnose, I have completely stopped being passionate about anything but helping others, no interest in the subject I learn at school, no interest in money or wealth in general, no interest in having any deep relationship with anyone. I used to be a high achiever, but now I am settling for the good. For instance, As long as I get an A in class, 91 and 100 do not really bother me, or passing an exam and mastering it do not have any effect on me emotionally. I know this is not healthy and want to be like my old self. I still have straight As, but I don’t care about school like I used to when I was younger. I am planning on becoming a doctor/ psychiatrist and help others. I am confident that I will make it happen, but I am afraid my lack of enthusiasm is going to affect me in any type of way.

So my question is, do any of you people feel the same way? Is this part of being a young adult, or does it have to do with my depression?

Thank you so much!