We all have to start somewhere. It might be difficult to get a good score in (or even submit something you're proud of to) your first few game jams. That's certainly how it was for me, I've joined many a jam I never ended up sumbitting to, lol. The game I made for this jam was the first I felt truly proud of. But once you get the hang of game dev, it is very rewarding. I would also suggest joining a jam's Discord server if it has one, I don't think I would have made it if it wasn't for the people in the GDKO community. My final suggestion is to never be afraid to learn. Each jam you join, each game you make, is an opportunity to learn about not just your engine, but other aspects of game development, as well as time management and other general skills. Keep going, I see potential in you.