TMI maybe(?) Help please! Shaving irritation!

Okay, so, hi, I'm 13 ( almost 14 )and have been shaving for close to 4 years at this point. I never ever shave without having my legs or whatever wet, at least a little bit. I use shaving creams when I have them, but most of the time it's soap and water. Lately ( and by lately I mean the past year or so ) I've been getting pretty bad irritation happening. It looks like this: ( lots of redness incoming )

It tends to happen on more sensitive areas like my upper thigh, front and back ( that's a picture of my upper thigh on the front ), my chest ( yes I know that might be weird for some people but it's a thing I have to do, PCOS sucks ), my stomach, and even on sensitive places below the belt if you're catching my drift. I'm fairly certain I'm shaving the right way so I don't understand why this is happening.

If anyone has advice as to how to prevent this happening and how to get rid of the quickly ( my friend is having a pool party in 6 days that I've gotta go to ), it would be greatly appreciated!