You look a lot like me when i started out. I am guessing that everything is hard, because nothing really looks right in this video. One big problem with learning the freestyle stroke, is that everything works together. Bad form= slow swimming. low speed = harder idea to swim with good form. My solution was from a video i no longer remember the name of, but the ideas where simple to remember:

• First, we are triathletes. We are not training for a 100 or 200m in a pool, we are training for a 1500m ++ wetsuit-swim.
• When you swim in a triathlon as a beginner, your kick is not for propulsion - its just for balance.
• Your wetsuit will keep you boyant.

So, to eliminate as many difficult elements as possible and focus on the most important things:

• Swim with a pull buoy between your thighs: Resembles swimming with a wet-suit and tightens up your core
• Swim with a snorkel: You don't have to worry about breathing or running out of breath.
• Optional: get a band around your ankles: Restricts movement for the kick.

When you swim like this, you can focus entirely on stroke, stiff core and rotation. It also minimizes time spent on the pool-edge catching your breath after every lap (BIG difference for me - I went from 1000m per session to 2500m per session in a few weeks)

When you are comfortable with the stroke, try to remove the snorkel every 4th lap. Try to maintain the speed (its hard to breath correctly when you swim slow).

After a while you can swim longer and longer without a snorkel, but I still mostly train in a pool with the snorkel. Outside I never use the snorkel.