How on earth do I change?

Hello.I'm a 24-year old woman. I've heavily isolated myself ever since middleschool.I've suffered from dysthymia, GAD and social anxiety for more than 10 years. I'm now looking for a therapist. I've never had longtime friends except for one childhood friend who I've known since birth.Through her I've also made a couple of friends but now I live in a different city. I've never been in a relationship either and my life is in shambles. Broke, no education, no social life. I feel very different to my peers and feel like im stagnating. Where I live society is kind of shut in so to speak so I have no idea where to even start. My problem is that I feel inferior to everyone and my self-esteem is super bad. I feel a lot of shame about myself. With co-workers I put on a jokester mask and people did like me I think. I had one co-worker whom I really liked and there was potential for something but the shame about who I am as a person overtook and I couldn't deepen that potential whatever it might have been. And now I just know that I cant continue like this. But the damage is irreversable. All those years of isolation have left me stunted. I've also noticed that I can't deepen from aquaintance level to friendship and even then the shame of who I am makes me feel like im not worthy of having people in my life. My social anxiety is not so bad that I cant talk to customerservice or smalltalk but groups of people and real connection is something I struggle with immensely.What should I do in this situation? Also I've noticed that the few friends I've had over the years were similar to me and were comfortable being at arms length.