My mother is a therapist, and I'd like to share a few things I've learned from her over the years.
One piece of advice is to start with the biological side. Getting enough sleep, exercising regularly, and taking care of your physical health can have a surprisingly positive effect on your mental state.
At the same time, don't hesitate to seek help from a therapist. They can help guide the way you think about your experiences and how you interpret them. It's a gradual process, but it really can make a difference.
I believe you can get through this. :)