Have I damaged myself?!

Okay-
so as a teenager I LOVED masturbation. I did it a lot and I watched porn. I used any object I could to masturbate and sometimes masturbated more than once a day. I also used a shower head and one or twice I allowed the water to go into my vagina but I stopped quickly as it was unpleasant. I've now read articles saying that using a shower head can cause fatal problems if water goes up there- and also that I could have ripped my vaginal wall from using brush handles and such without lubrication.. and finally that I could have an infection from not cleaning stuff.
I know this is pretty gross and embarrassing but I wanted to know whether I may have damaged myself. I haven't had any symptoms of problems from then and my partner has 'looked' there and everything's normal. Sex also feels normal and isn't painful, but I was just checking out of concern.

My boyfriend also sometimes uses a hairbrush handle on me, is this dangerous and should I stop?

Thanks