People on this site have overcome SA. They probably don't post in the frustration section that often though. I don't criticize them for that, but I agree with you in that if I got over my SA and knew the people on here were suffering I'd try to help them out. I did so on a regular basis not too long ago, but I got tired of the forum rules, and it's a pretty long story so I won't go into the details, but I agree with that part anyways.
Some of the members that have overcome SA have posted some very helpful threads, like this one by LucidVision
. There are a few others that I really like also, but I don't feel like spending time digging them up honestly (I forgot what they were titled anyway).
I've made vast improvements since I was at my worst, I can honestly say my anxiety isn't nearly as bad. My depression and loneliness is another battle, but I'm confident I'll figure that out eventually (hopefully sooner rather than later).
If you really feel like you're contemplating suicide, please use one of these resources
for help. While I believe SA never really completely goes away (without drastic improvements in your life situation), it can certainly be treated, I'm living proof of that. Your self esteem also seems like an issue, that's just as serious, in my opinion, as your depression and your anxiety. I highly recommend therapy (if you're not already going).
Best of luck to you.