hey so when i was younger i went through a really dark time of depression and stuff, but then i started to stop giving fucks about everything and started drinking and smoking and just partying hard in general. Ive been wondering is this is just a form of coping and if so, do you know how to solve this out? DDD:

It is a form of coping, as for coping, I'd start with quitting drinking and smoking.

I've been through the same. I actually didn't go for smoking and drinking, I looked for something to do. You should find an interest such as writing or singing, just something you can learn about to distract you. I write stories about escaping the feeling of depression and It works a bit. With creating art you can be carefree and not have to worry too much about life. You can create your own world and write/draw/sing out your life. That's my advice. Also what creepjojo42 said you should put down those harmful substances. It may be hard if you've gotten too into it, but it's worth it if you can. Hope you get better!