[Skill Improvement] How do I stop overthinking ?

As the title says, I feel like I am overthinking a lot whenever I play VGC.

I started playing VGC about 6 mopnths ago, back when Champions dropped. I thought It would be the perfect time to finally start playing VGC. Since I have a few years of Single battles on Showdown so I am familiar with pretty much all the strong pokemons available. Plus, I've been watching Wolfey's content for a little while (which is where I got the motivation to play VGC in the first place.)

At first it felt pretty good but at some point I'll reach a cap where I feel like there's always something wrong wether it's before a battle or during a battle. It's always about a crucial pokemon that I should have chosen, a wrong move, a wrong target, etc.

At first, I thought my problem came from how quickly I made decisions. While it probably fixed a few problems, it wasn't the only problem.

Recently, I picked up a Mega Houndoom / Mega Kangaskhan team from youtube. It's a team that works both with sun and Trick Room. I thought it was a pretty fun concept but since it involves two modes, it makes me overthink a lot about what i'm doing.

I thought about playing a more meta team but it just doesn't sound fun. I hate Charizard and Archaludon so I don't wanna play either of these mons.

I am sorry in advance if my post is considered unrelated to the sub but I don't know where else I could ask this question. Since it's the main VGC sub I thought that maybe I could get my answer or at least a first step in the right direction here.

How do you guys deal with overthinking ? I know the problem might be caused by something deeper but I feel like a few tips wouldn't hurt.