what's wrong with me? is it social anxiety?

Im a 33yr old woman w a huge problem. In my younger years I was very social and wild which alcohol played a huge part in. I caused myself alot of problems abusing alcohol and now after 30yrs, one bad divorce and a whole lotta legal problems later im finally getting it. Ive quit going out which reduced my "friend" circle dramatically and am trying to pick myself up, well whatever is possible which is almost nothing. After having my child 3yrs ago ive dedicated my entire time and attention to him. One major thing that's affected me is my social life, i can't hold a conversation if my life depended on it. Ive become bitter from people betraying me and ive closed up. I trust no one except the whole 3 friends that stuck w me through thick n thin. At work people avoid me,i'm told i look intimidating which i do only to keep people away. I hate it, im really miserable but I can't find a way through this. im terrified of crowds and am overwhelmed when i go to stores,so i stay home. Any insight?