I don't know what to do?

August 19th my dad had past away from a heart attack. My mom and my brothers took it harder then I did at the time. When my mom had told me that my dad had ped away I was just like ohhh... I didn't cry or anything. She did way more crying then anyone in my family. And he was her ex husband. But she still loved him and cared for him so I kinda understand why she would. But at my dads funeral they had the 21 gun salute because he was in Vietnam so yeah. And when the guns went off I was trying so hard not to cry. My brothers and my mom were bawling there eyes out but I wasn't. But now I feel like my dads death is effecting me more now. Anytime someone mentions day or something I kinda get teary eyed. And anytime someone mentions him I do also. And I've been having a lot of dreams about my dad too which I really would like to know why? But anyways if anyone could give some tips it would be a lot of help. Thank You!