HELP PLEASE

I have never been able to orgasm while masturbating and I want to know what I can do to finally get there. I have fingered, used the shower head, touched, rubbed, done it all. I don’t have any toys bc I would have to ask my mom (I am 17) and that’s uncomfortable for me (we aren’t super close). I feel like I’m almost there but I might be too sensitive (if that’s a thing?) Whenever I touch my clit, my legs twitch and I feel like I have to pee but then it gets too intense and I can’t keep the rhythm. Is it supposed to be like this? Ladies I need help.