Does anyone else have self-doubt when winning?

I am new to fighting games, and spend WAY too much time in training and offline since I get nervous online. Every once in a while though, I get online and lose a ton of matches. On that rare blue moon, I may win a match.

However, I instantly think that the other player must have been extremely new and I was going too hard on them, or perhaps I just got lucky and mashed my way into winning. Or maybe they just jumped alot and I know how to Down+heavy.

Anyone else find it hard to celebrate wins?

EDIT: Appreciate the insight folks. To be clear, I don't mind losing - I learn alot from it. This is specifically about winning, and how sometimes it can feel as though it was less deserved depending on the circumstance.

Obviously winning is cool, but the conversation is meant to be a bit more thoughtful than surface level, mental games if you will (Less about win = good, but rather why did you win).