My ceiling paint in my bathroom is peeling how do I fix that?

You can do it!! Here's a helpful tutorial to get you started...

You simply need to scrape off any lose paint and then sand the surface completely smooth by hand or with a hand sander. Then prime it and repaint it. Do make sure you are using paint that is worthy of an area with lots of moisture... like the bathroom. Also, wait between coats of paint to make sure each coat is completely dry first. If possible, don't use the bathroom during the painting and curing process to insure that there is not any added moisture before the paint is completely dry... (from the shower or bath humidity).

It sound like you need a bathroom ceiling fan to take out the moisture from baths and showers. If you are going to do the sanding, please wait for the ceiling to absolutely dry before any painting. Try to minimize future baths and showers until the ceiling fan has been installed and has had ample time to dry out, or it will just happen again.

Be sure you have a vent in the bathroom, or a door that you can always leave open, when you shower, or bathe. Keep the door open, or the moisture will add to the problem. Always wipe off your mirror when you get out of shower, tub, if foggy. Have someone, check the vent in the bathroom, and make sure it is working properly. This will help alot, in the BathRoom. Check with Lowe's as the what to do with the ceiling, and they may cover more ideas than what I did mention, ok? best wishes, J.