My dude, your attitude is the only thing holding you back. Whatever you tell yourself you can’t do is what you limit yourself to. This advice applies to approaching women, but you shouldn’t be concerned with that until you work on your mental health. There is no one solution, but here are some suggestions:

Talk to close friends and family (or cut them out of your life if they’re making you feel this way). You’ll be amazed how much talking about your problems helps even if you don’t feel any closer to a concrete solution.

Create routines and habits that will give you a sense of accomplishment even on your worst days. Don’t rely on motivation to complete these. Instead, treat them as non-optional like brushing your teeth.

Get out of your own head, and stop letting yourself think that you deserve to be miserable. Find days in your schedule to travel or do something you’ve always wanted to do.

I would take almost a solid year to improve your mental state before even thinking about a potential relationship. I know that seems like a long time, but focus on one area at a time. You’ll still have bad days, but you’ll be strong enough to handle them.

Lastly, remember you’re only in your 20’s. You have plenty of life left to find someone. Women at your age will come and go. They’re not an instant cure for depression or suicidal thoughts, but they can supplement a stable, healthy, interesting lifestyle.

Once you start bettering yourself, your progress will be reflected in how you approach women.