i could not do any pull up at all. I began doing negative pull ups on my door. It was horrible :-D But i gained the strength through australian pull ups. In the beginning i was even to weak for them and not able to do a negative dip at all. It all comes step by step bro. I really recommend you doing the australian pull ups! In another thread i wrote about this about them:
Progression 1: This is the easiest progression. :-) Believe in the beginning i struggled a lot with this one.
Put your feet on, so that the knees are bent (90°). Hands shoulder width.
Your body is a straight line. Arms are bent. Lift your breast to the bar/table (waist high). At the highest point, you should contract your shoulder blades.
The further the hands are apart from each other, the more you focus on your back muscles. The opposite that if you go tighter you focus way more on your biceps.
Grip variatons :-)
Do not know the word in english but:
"Normal grip": hand surface shows to your feets. -> trains the extensor of your forearm
"side grip": you can do this on the sides of the table, hand surfaces show towards each other. -> trains the outside of your forearms
"unter grip": hand surface shows to your face -> trains the flexor of your forearm
Put your feets on a chair/couch etc. You will definitely feel a difference. but be aware that your body is still on one line!
If you want it harder, lift up one of your legs. your quadriceps and the leg muscles have to work aswell to keep the body in his stright line.
Work with these! I also use them !