What guage strings do you use? My fingers don't hurt but I have very strong callouses. My fingers used to hurt me when I started busking and playing more than 6 hours a day but now they don't hurt any more. At one time I got tendonitis in my ring finger from trying to do the Chuck Berry thing and I strained that finger, kept playing, then I couldn't move my ring finger and had to stop playing for awhile...then I sang to a CD player on the street. Be careful not to get a repetitive stress injury. I know one guitar player who plays 12 hrs a day and has serious tendonitis that he can't get rid of and he has to tape his baby finger.
Is it your fingertips hurt.....or are your fingers aching. Don't push too hard that you get an injury.