shaving 🪒

Ok so I shave, just like many other girls going through puberty. I shave down bellow cause I don’t like it and I want it gone. The first time I shaved down there I shaved all of it off, afterwards it became itchy and I had shaving rash. I stopped shaving for a while and it had just overgrown. So I started shaving again but being very careful, my friends later told me I’m only supposed to shave my bikini line. I now have this blotchy rash on my privates and I don’t know how to get rid of it. Any help would be much appreciated👏👏