I always take forever to play games, still haven't beat Skyrim like others say. Infamous Second Son took me about 15 hours whereas many folk powered through it in 9 hours or less. I tend to take my time and have fun vs rushing through it and then complaning that there was little game time. :-/
So don't worry about it. You're not alone. Play you're game the way you want to, enjoy it, have fun! Don't stress!