Dad passed away at the end of 2024 and many realizations and regrets hit me. How do I deal with them?

21M my dad passed away on December 28 2024 when I was 20. Long story short he was driving and randomly passed out while he was driving and I was in the car with him.

Aside from the events of December 28th replaying i have some regrets. Some of the regrets were that I wished I spent more time. I had always been in my room doing homework late as im in school and often would do homework then play video games in my room. he also was always worried about his health even when doctors said he was ok. I admit I would get slightly annoyed when he kept bringing it up even if he went to the doctor. I wish I wasn’t as in the end he was right.

how do I deal with these regrets?

I also came to many realizations. He never got to see me graduate university. he was very hopeful that I would succeed in getting my undergrad degree as well as masters.

A other realization is that he never got to see me have a girlfriend or even get married and have kids. He always encouraged me to try to talk to girls as he knew I was lonely. He would encourage me in many ways by offering support like money (when I was in high school) for any girl I asked out, allow me to use his Mercedes, as well as giving me ways to be more confident In talking to girls.

It’s just sad that he will never see these things and was wondering if there is any way to deal with these nagging realizations.