Struggling with Social Anxiety and Isolation

Hi! I'm new to this app and really wanted some advice and am really hoping to be abke to talk to people in a similar situation to me. I've always been painfully shy but I've had severe social anxiety since the age of 11 when I first started getting bullied at school. This has also led to depression and I've been almost completely socially isolated since. I turned 26 the other day and literally have been in a pit of severe depression constantly thinking about the fact that I've got zero friends and have never been in a romantic relationship at all (I've never even kissed anyone). I'm absolutely terrified that I will be alone forever. I literally have no one who cares about me. It's not like I want to be alone, I really want to meet someone and get married and have friends but I'm so scared of any kind of social interaction because I just think everyone is going to bully me / hate me / judge me. Can anyone relate to this at all? Does anyone have any advice at all for how to overcome this and start having relationships? I would really really appreciate any help anyone can offer. Thank you!