How do you fix a bad haircut at home?

I'm so sorry! What you should do is to not cut them yourself!! But plan a day to go to a simple barber shop and before you leave, straighten your bangs so that when you ask to get them cut across your forehead, it will be easier for them. You don't need a fancy swancy beauty salon. Those have the stubborn people that always try to cut hair their way, which is annoying. Ive had my hair done at those places a few times.