It’s okay to mistakes. You can’t know everything in advance. In fact, perhaps there is only very little you can know before it actually happens. Therefore you should be kind to yourself if you made a decision that didn’t turn out like you hoped for. You should give yourself some grace. You live, you learn and you move on. Next time you’ll do it differently and because of that it’s probably better to call it a lesson instead of a mistake. Accept the outcome and know that next time you’ll do better. It’s okay to make mistakes or have some lessons.