Hey there Pumpkin, welcome...

This might be a silly question, but are you standing or wriggling occasionally on your seat?
If you have any body part in one place with pressure on it for a while it goes numb... you know, sitting crosslegged and your foot goes to sleep...
I go numb sometimes when i am very focused on my ride, and forget to move about...

If you are relieving the pressure as you ride then no its not normal... and as jo suggests, do a search, there is a great wealth of wisdom and experience on these boards