The key thing about flying is that you as pilot are responsible, for people's lives. Everyone who flies has sufficient knowledge and skills, but many don't have good decision-making, particularly under pressure.

You're likely to learn some bad habits from self-teaching in simulator, but those mostly can be unlearned. The real problem would be having excess confidence. That's the #1 killer.

Flying a real plane in challenging situations should frankly scare you into being a stickler, and staying well clear of your personal limits.

If you want to be a good pilot, start with 10+ hours of glider training and then train on something other than a Cessna high-wing (which takes almost no skill for stall recovery).

And for knowledge, learn the fundamentals from the FAA books (not the internet or experience in a simulator).