Help me improve.

Here are 3 short clips. Please give me some advice. I think I'm standing too far in front so I'm dangling my hands in the back to balance the board. I also can't stay on the wave for long period. I just slide off the face quickly and loses speed.
I try and not get in other surfers way but sometimes I have to or else I won't be able to catch any waves. I tried moving closer to the lip but it was packed and you have at least 3-4 all taking off at same time right next to each other.
I try and not get in other surfers way but sometimes I have to or else I won't be able to catch any waves. I tried moving closer to the lip but it was packed and you have at least 3-4 all taking off at same time right next to each other.