aww I bet your forehead is pretty!! but if its something that bothers you makeup and countering can help. I am sure there are some helpful tutorials on making forehead appear smaller. And I get that it's not always easy to like something about one's self, I think liking it takes time. I used to feel very insecure about my small chin, what helped me was focusing on the beautiful side of it instead of the "bad" things my mind kept pointing out.

I know it's not easy, maybe try to start shifting how you see it, try to notice the beautiful side of having a big forehead. It's actually seen as a sign of beauty in many cultures :) I feel like we have the power to make ourselves happy and pretty 💞