I've had depression and anxiety since I was around 6 years old (likely due to trauma during that time), both reaching their peak at 12. Back then it was ridiculously severe where I was also pretty badly agoraphobic and would end up having panic attacks frequently and as a child I would cry a lot and be punished for it.
Things have gotten a lot better since then but I've been relapsing a lot lately...(especially now after a pretty bad incident online)
I also have Asperger's and while it's not a mental illness it has done a good job at augmenting the problems. I also developed multiple sclerosis 2 years ago, which also serves to make things worse and there are days when I literally can't function (getting in the way of work, among other things) and don't even have the energy or will to exist. I try to be strong and deal with this, most people can't even tell anything is wrong with me nowadays so that's a good thing, but it's so difficult. I'm trying so hard though...because of all these issues I don't think I'll ever be able to fulfill my goals in life. It's also been brought to my attention from people who have it that it's likely I have PTSD as well, though I always assumed all that stuff was part of the depression/anxiety thing. I'm scared to talk about that with my therapist because I don't want any more diagnoses...
I guess though, due to all the problems I've had, I'm very understanding and empathetic to other peoples pain. It makes me so sad to see people suffer and I want to do all I can to help them.