>I wasn't able to perform any work when I tried weed.
It is because you are not used to the THC in your body.
>Weed just makes you want to sit down.
That's just not true at all. Weed works differently on every person and what it does for me is giving me insane focus. I have worked and written exams while high and it worked perfectly.
Once I drifted into addiction and started to vape my weed using picrel every other hour, the negative effects started to outweigh the good ones. I feel less smart and overall I don't even know my sober self anymore, hence trying to quit.