I am extremely sorry for your loss. I know exactly how you feel. My dad died 14 years ago. I had just turned 11. I remember because it was 15 days after my birthday. My dad and I were very close. We'd go fishing together, go to pawn shops, swap meets, and whatever else you could think of. I totally miss him too. I still love him and remember him quite often. We have a family home video from 1989 when I was in Kindgergarten and 1st grade. I watch it to see how goofy I was as a kid and to remember him. He was so cool!
Later in College it really hit me. Don't know why, but it did. I would write letters to him. Sometimes I'd lock my dorm room and I would put a chair in front of me and act like he was there and talk to him that way. Or if I was in my car I would talk to him that way. Here lately it has hit me more. I'm 25, going out with this awesome guy who loves me and he won't be there for my wedding and when I have kids.
I know how you feel sweetheart. It hurts. Give yourself the time to grieve. My mom has a hard time with it pretty much around Christmas time every year. Time will heal. It'll be ok. Remember he's lookin down at you just smiling knowing that you miss him.
God Bless You,