I lost my dad at 26 (he was 50). He died suddenly of a heart attack and much like you he was my best friend, we were super close. It's been really hard, especially now that I have 2 kids and he's not there to meet them. He also missed my wedding, my graduation from law school and getting called to the bar.
That being said, I draw a lot of comfort from the time we did have and the special relationships we had together. I had no regrets about our relationship and I get a lot of mileage with that.
I cannot recommend grief counselling enough, it will help you work through a lot of issues. Good luck man, I know the pain you're feeling.
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