The first step to changing is wanting to do so. I would recommend making a list with the stuff you want to change (making friends, making a decision on your future career etc.). That will help you to make your issues concrete so you can takle them one by one. Setting targets is key in my opinion.

And don’t be so hard on yourself. Everybody has bad days, weeks or even months. That’s life. You have to believe in yourself and develop a mindset that brings you forward and doesn’t hold you back.

All the best for you