Ok, several things going on here, and looking at your videos I would think that they are mostly user error.
I would love to, but I really don´t have the time to teach you how to fly a 737 step by step, so here is an idea: Try to fly the tutorials I have made for this aircraft, you can find them here. You can probably avoid a lot of frustration and slowly learn to operate this aircraft.
These videos are a bit outdated, but will still mostly hold true.
Cheers, Jan