Sad and anxious for no reason

I’m just sad for no reason. I still ruminate on the past and where I am in life. I guess maybe that’s kind of a luxury a very sad luxury. To be alone and not deal with anything and wallow in my own sadness alone. I guess the more older I get I realize I can’t tolerate people like I used to. And I’m in my mid thirties. I’m 35 which is the start of a mid life crisis. Your body is starting to change and things aren’t what they used to be yet I still reminisce on the past. Low key wishing it would come back but it’s never going to. I know life will just get harder and harder from here. The only is way is to toughen up but how long can I take? What if I don’t want to deal with anything anymore?