Second-Guessing yourself

As of right now, I’d say this is my biggest weakness. I keep second-guessing myself.
For example, I was playing against a Karin player. It was the 3rd round, I got a knockdown and only had to make 1 read to win the game.
My first thought was EX DP, but I doubted myself, went for a meaty cLP and ate the DP. That cost me the match.

This keeps on happening to me quite often. I do feel like I’m not bad at reading basic situation like that, but I doubt my thoughts :confused:
How should I go about this? It’s really frustrating.