Understand that a sound game is the foundation for mental strength and confidence. BOTH of these aspects will ultimately challenge you throughout the time you play and both will have an impact on how you get better.
From the feedback you're getting here, one side is trying to help solidify and make your game sound by offering advice about the disc(s) you're choosing to use, and the other side is saying that mental toughness and the ability to let negative experiences slide off your back is the key to what you seek. Both sides are right.
The way you shake it off in my experience is that you take this game with a grain of salt and understand that no matter what the outcome, the reason you're at the point where you're at to begin with is because you ultimately set out to have fun, first and foremost. Try to be open to the advice that people are giving you here, understand and build your foundation for a stronger game, and before you know it your next thread will be "Had the BEST experience playing..."
And FWIW, I HIGHLY agree with those saying to disc down and try some different things. They're offering advice to help you with consistency and form, which in turn will allow you the ability to build the overall confidence that will take your game to the next level.