About my life

I(21F)(and studing mbbs) am self doubting alot and I am thinking ,is that common to think of our self that I will not become Good in my profession

No one is trusting me now and I don't think that anyone will do in future

I don't have any confidence in my life and what the fuck should I do to improve my life that people trust me....

And another thing is that my friend circle first doesn't trust me and make me feel unexisting .

One of my friend knows that I have more attachment to her but I think she purposely making me feel like i am not existing ,she doesn't have me in her priority.

I think I am not a good person.