First, I get that non-ADHD people don’t understand unless they are around someone else. It sucks being overwhelmed and misunderstood, not having anyone to turn to. Hopefully you have at least someone there who clicks and gets you.
I can’t offer much in terms of getting help from classes, but have you tried talking to the professors for help?
Take some time and focus on yourself too. You’re not in the same situation, so just keep your expectations realistic and don’t compare yourself.