Do I need help?

I feel like I might need mental help. My dad raised four kids all on his own. My mom left when we were 9 months, 2 yrs(me), 3 yrs, and 5 yrs old. My dad had to raise us all with no help from anyone, my mom never paid a dime in child support. To this day, we still have no idea where she is😓 my dad is the greatest guy in the world. Everyday in the summer, he would bring us fishing, everyday even though we had no money would bring us each a candy bar after he was done with work. (Even when he was starving) he did everything he could to make us happy. I am so close with him, we talk everyday and I go visit every weekend.  My siblings aren't in the area anymore so I do not talk with them often. But... I feel like I will need mental help once my dad passes. I think that when he goes, I will need to as well. I couldn't live without him. Is this normal? 
I am 25, happily living with the man of my dreams, have a great little 1 year old, great job and car....but I keep wondering what I will do without my dad. I am also extremely shy, not sure why. I still, at 25 years old get picked on about it. So because of that, I have like 2 close friends.... Other than that. I don't like people haha.