Life is too overwhelming for me and sometimes I feel more and more like it's not worth it.

I'm usually negative about everything. I'm tired. I know I will keep living and will find happy times, but I just don't think it's worth it. I usually don't think of myself as depressed but life is too hard for me. That's all. Does anyone else feel that way? I don't mean physically hard, but emotionally hard. DBT,therapy, and yoga help, but I have to live in my world where no one understands how difficult everything is for me. I look normal, but I overreact to everything and think of myself as a failure. I don't want meds. I tried.
I just want to add that I have a lot to be grateful for, and a lot to be happy about in my life yet I feel like I can't cope with my emotional challenges.