There’s a theory that it doesn’t get better with age for anyone but many learn coping and masking mechanisms.

But yeah unfortunately what you’re describing is not rare. What you’re describing sounds an awful lot like you might be burning yourself out by the end of the day using all of your energy focusing on school and your internship.

If you aren’t medicated that would likely be the first place to start. I know everyone hates hearing diet and exercise, and they absolutely aren’t the cure some claim, but for myself at least they are a vital component of a holistic treatment. I need a combination of stimulant medication, healthy diet, regular exercise, sufficient social interaction, decent sleep, consistent habits, and the proper rest in order to be my best. Some of these can be trimmed with minor losses, but meds are bare minimum to function, and diet, exercise, and socialization are the difference between “can work then break down at home” and “actually function in my home life”.

I know it can be daunting and I just flat out couldn’t do it at times in college. My senior design project wasn’t going to sit around for me to go on a bike ride. But when my brain got fuzzy walked a lap around campus. Put on a podcast and move your body. And most importantly this isn’t all or nothing, this is every bit helps, and you can use that help to get another bit. Healthier food (like peanut butter on whole wheat for lunch instead of take out or ramen) may give you the energy to take a walk. Regular walks might give you the energy to go out with friends for an evening. These are habits and it took me most of my 20s to figure out and implement this.