Help Please!!!

So I'm underage and I can't get toys like everyone else but I do have a vibrating tooth brush that I don't use on my teeth. It takes me at least 15 minutes to cum and I cant rub my clit bc I live in the same room as my little sister and I get super wet so it gets loud. So what should I do??? Please help me. I'm scared if she ever wakes up she'll see me.