I stopped feeling like a person when I stopped smoking weed

I smoked weed daily for about 4 years. It made me feel good, it made me motivated, it made me enjoy things, it made me so happy at times, it made me be able to deal with everything going on in my life. And then one day I started getting extremely sick from smoking weed and I believe I developed CHS which means I had to stop smoking weed and can never smoke weed again.

I stopped about a year ago and I don't feel like a person anymore. I don't enjoy anything anymore. I don't have hobbies. I don't go out anymore. I sit on my computer all day because it's the only thing that can give me some kind of dopamine. I don't feel happy anymore. I feel like a shell of a human being. I don't really consider myself human. Well like obviously I'm a human being but not like everyone else.

It was so hard on me to have to quit because I knew I'd be like this and it hurts more that I could have it all back if my body wasn't fucked.

Why do I feel like this? Why is my brain only able to function normally when high on weed? Is there anything I can do to be a normal human being again?

Adding this because I've seen some people mention connections, I strongly believe I have autism and adhd. I've also been extremely depressed for the majority of my life and I'm diagnosed with bipolar disorder.