Nerves are going to plague for a while more. I have logged at least 300 hours in some sort street fighter game (not even counting guilty gears, tekken, VF) and I’m still learning and still get nervous to the point where my execution suffers as a result. If you watch me play I go in, poke with some normals, try to bait them to whiff a special move, then punish, then back away… and my win ratio is a little better than yours (4/10)
If you read Malcolm Gladwell’s Outliers, he talks about what it takes to master something and the general consensus is 10,000 hours to really master what you are trying to do. How many hours do you think Daigo or Justin Wong have logged in street fighter and they are still trying to get better? I’d be they’re close to that 10,000 hour mark. The way I see it, you’re only 1.5% of the way to mastering the game.
Conclusion: it takes time. Fight, fight, fight, fight - win, lose, or draw there is something to be learned from each and every fight. And if you’re never planning on trying to attempt a big tourney against the best in the world, then maybe you should set a realistic goal for yourself and be happy that you are at that level. Remember, there will always be someone better and always someone worse than you. Try not to over-think it.