Believing in yourself is the best thing there is... Most people give up on their dream before they've even started ;) So no, it's not stupid at all! Now, as for your idea, I think it might be missing a few special ingredients to meet your perfect customer... but practice makes perfect... so Bravo and I'm keen to follow the project! I myself have had a project close to my heart for almost 6 years and I know I'm at the end of the process to launch it this year or early 2025.... Keep going... Believe in yourself, it's more important than you think!
Don't think you are. Know you are.