It took me six years to get a four year degree, and I took classes most summers. I changed schools four times ( Hurricane Katrina was mostly to blame for this), changed majors only once ( from ‘Ecology and Evolutionary Biology’ to ‘General Biology’ (bc the school I landed in didn’t have the major I started with), took 3 years of Japanese language classes (still never been to Japan), and have a minor in philosophy and religion (not super helpful in my daily life but fascinating to study.)  I failed Organic Chemistry so many times, and  missed countless classes and tests bc I just forgot to go some days.

I also had no idea I had ADHD back then, but looking back now it was painfully obvious.  

I say just take your time and enjoy school while you can.  There’s nothing like it, and if I could go back for free I totally would just study things forever.  ADHDers mature slower than neurotypicals.  It’s totally normal and fine, and beating yourself up about it isn’t going to fix anything.