This was important for me. I have use molds from so many different manufacturers, I've just found certain discs do what I like over others. So throw whatever works for you. But throwing in a field is key. It helped me learn my discs and exactly what I could do with them when I throw them.
Also, just have fun. I don't compete ever, but love having fun competitions with my friends. "Loser buys the beer." It's just a game to me. Maybe just slow down your throws. I know when I get ancy and frustrated, I speed up my throws, which never helps me throw any better.
I hate seeing people argue on threads about discs, just throw what you like, and have fun doing it. Chances are everyone who is yapping out negative replies on any thread are throwing just as bad as you, or however bad you think you are throwing.
To me, getting 4 or 5 great throws in a round, (or avoiding 2-3 trees) is enough to make me feel good about playing. Those are the throws you go to sleep thinking about, and what makes you want to go out the next day to play again. Keep your head up, dude. (Andy Grammer sucks)