I know how you feel...it's so, so hard to lose a parent. I lost my mom almost six years ago now, and some days it still seems like it only happened a couple of days ago. But -- I can tell you from this end of things that it does get better with time. You'll still miss him terribly, but you'll learn to celebrate the time you had together much more often than grieve over the time you don't have with him anymore.
I'm sure everyone's different, but I tend to think pretty logically, so in my head I sort of think of it like this: our lives with our parents are only meant to overlap a certain amount, and then we're supposed to be on our own, as hard as that is. I didn't wanna live life without my mom, and I still don't, but we don't get that choice -- and at least if I can't have her, I still have all the love and humor and lessons and silly moments and secrets and stupid fights we shared over the many years we had together, and then there's the added bonus of the (many, many) moments when I realize I'm about to do something mentally, emotionally, or physically that is "just" like my mom!! So in a way, our parents are still alive within us -- and also within your children -- yet another cool bonus.
Your dad is still and always will be alive in your heart, and he's still telling those ridiculous dad jokes. You just might have to listen a little harder...
P.S. A book I found that helped me is When Parents Die by Edward Myers. [https://www.amazon.com/dp/B00AFZ8PKC/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1] Not sure I formatted that link right, but it should lead you to the book eventually lol
Hope some of this helps. It took time for me, and a LOT of conversations with my grief counselor! Hang in there. It DOES get better --