Fast-Growing Hair

My hair tends to grow really fast. When I shave my legs, the hair is visible the next day so I always have to shave my legs seconds before I need to leave for an event where my legs will be showing or else by the end of the day my legs wil be super hairy again. Also when I shave my underarms the hair is visible and completely grown back in half a day. 
Is this bad? Should I see a doctor about this? All of my friends can go three days without shaving but I have dark hair so it it always really visible. I am wondering if it just genetics too because I am Italian and everyone in my family has really dark hair. But I am also Irish so I have light skin which makes my hair more visible. 
Any thoughts on this? Has anyone experienced this? Any suggestions to help me?