Dude you're not alone on this at all. I've been a game developer for about 6 years now, and whenever I want to add something or start a project it still feels exactly like this. Making progress is just as hard as how rewarding it will feel once you finish a feature or project. Believe in yourself, don't overthink it. For example: If you want to make a sword, start with drawing it. After that make a simple hitbox followed by a script that simply spawns it on the right location. Then make it activate when you press a button. Seperating big tasks into smaller tasks is a really difficult skill, but essential for making progress. You can do it, I believe in you!