Watching the techniques is one thing, but to learn how to do them takes lots of practice. If you have been playing for 6 months I would reckon you are in a phase that I describe as 'you know enough to be dangerous to yourself'.
In other words, you know what you should be doing, you probably do a lot of it, but it just doesn't tie together yet and, for a good while, you will actually play worse than if you were just flipping wildly. Give it time and it will slowly all come together.
And I do mean slowly. I've been playing for just over a year now and I'm only just getting past the barrier I describe above. I play in a number of leagues and compete in tournaments, and I still only finish ahead of first timers around 60% of the time.
I too have gone through times where I just feel depressed and that I'm not getting anywhere. But every now and again, for whatever reason, my brain seems to flip a switch and suddenly I'm executing on something that I was struggling with before.
That being said, there are people I play with who are just simply lightyears ahead of me. I'll never be as good as them but at least I can give them a run for their money sometimes.