My 2 week old son wont wake up to feed. I have to wake him every 3 hours to insure he is eating enough. It?

takes 30+ minutes to wake him enough to eat off one side, sometimes for only 10 min. then hes out agian and I have to try to wake him up again which is even harder because he is somewhat full. It takes about 1 1/2 hours to feed then in another hour or so Im at it again. Is this normal for him not to wake upto eat? At night I let him sleep 4-5 hours and he STILL wont wake up. Its making feeding SO hard. My questionis will he start to wake up on his own soon? or is this how its going to be with all his feedings? Also if he only eats 10-13 min on 1 every 3 hours is that enough? Should I pump the second that doesnt get used that feeding? Please help this is so frusturating!