Hi Mimi. How old are you? Do you live with your parents? They contributed to your anxiety so they are likely not going to be too helpful or understanding.
I would see if you can talk to a school counselor if you are still at school or college etc. Can you talk to a family doctor and see about some medication?
As far as softball or other activities go, once there, you could meet and make friends. If you could push yourself to go without a friend, even if it is uncomfortable ( many things are for people and then they get used it/relax)you
could try to just do it. Then I am sure it would give you a measure of confidence and pride and you could build on this step to make progress in other situations. You can overcome this!