social anxiety

I have anxiety and depression. I can't be around people because I get so nervous I start to shake and can feel my body just getting really hot and I start sweating. I have been dealing with this ever since I was 15. It sucks because I have zero friends. I don't go out anywhere, even when my bf suggests something fun, I always lie and say I'm tired or don't feel good. He doesn't understand how I feel really. he knows I have anxiety but doesn't really understand how it feels. I am 28 years old with no friends, pretty much no social life. I rather stay in the house then go out. How can I change this? anyone else feeling like this? and I'm not on any medication. I did take meds when I was first diagnosed with anxiety at 15. but I stopped taking them when I was 16. I kinda just deal with it myself but I am so sick of not having friends!!! I see people going out having a good time and I'm at home because I'm too scared to be around people!! I really want to change this.