I am really sorry about what you are going through. I understand how you feel.
Social anxiety can be so difficult. Especially when trying to make new friends.
I recently graduated and one thing I learnt was that all my past friends were just existent. I never truly loved them. I only realised after, that I only need 1 best friend to truly reach my full potential. As HappyHelper88 said, it is quality over quantity.
Everything will change after you graduate, but not in a bad way, an amazing way. You will accomplish great things and start to go into the real world.
You will be okay and I know it.
Please stay safe and i am always here to chat.