Is it okay to worry a lot about my professional future?
Is there a reason why you are worried about your professional future?
I think I am an introvert. I believe it will affect my career later on.
It is good to try your hardest in your career. You can take classes or join group activities to get out of your comfort zone and make new connections.
I'm on my own, I'll handle it myself.
Considering your future doesn't have to be done alone. You can be an introvert and still have friends and family that want to help you become and stay successful. Try leaning on someone else from time to time to lessen that burden.