My advice
1. Hit the gym twice a week - focus on compound movements: squat, bench, deadlift, pullups and deadlifts. It will increase your muscle mass-, bone density-, DHT, it will improve insuine sensitivity etc. This will make you more confident, but don’t obsess about it.
2. Talk to girls - any girls, even if they’re “just” friends. And if they “friend zone” don’t get upset - you can still be “just friends”. Make sure you actually enjoy the conversations. It takes practice, but eventually you will be relaxed and you will have effective and laid back conversations without a stress reaction. Low dose cyproheptadine can help if you’re anxious.
4. If you have any past two unresolved childhood/life trauma deal with that first.
3. Go out and enjoy life.