How long does it take you to get the tingly feeling? I think you are almost there at that time and you just need to keep trying and practicing, to make it feel better. If your "friend" takes 45 minutes as she says, it seems to me that she's the one who needs some imagination. I wouldn't listen to her too much. I think she's trying to make you feel bad.
I'm a guy but when I was your age, boys lied to each other all the time about sexual things just to make the other guy think he was inferior.
If you get dry just use something to lube yourself. Spit works well but there are lubes made for that purpose. KY jelly is one. Baby oil works too.
If there is a guy you would like to have touching you, think about him doing whatever you would like to have him do to you while you are doing it. Make believe it's his fingers rubbing your clit. If you get dry, don't rub if it hurts, or rub lightly. I like to dry rub myself when I masturbate and sometimes I dry off my wife's vulva and clit and dry rub her too but I'm careful to be very gentle and touch her lightly so I didn't cause any irritation.
There are many different ways you can do it. Sometimes I use the split finger technique on her. I rub on both sides of her clit using my ring finger and index finger. Your clit has roots like a tooth that go down both sides of your vulva. Rubbing those sides really gets my wife going, then I let my middle finger touch her clit as I keep rubbing up and down on the sides. Her clit is hidden so I'm not actually touching it directly and I can apply more pressure. If you can touch yours directly it should feel better. If your hood covers it on both sides you can hold the hood between your index finger and thumb and roll it around inside the hood. You can pull the hood back and rub the bare clit. While I'm doing my wife she loves it when I switch up and rub across it sideways.
Just keep trying different ways to find what does it for you. That's what masturbating is all about, for you to figure out what you like best so you can show your lover or husband when the time comes and he will be able to give you a wonderful sex life.
As they say: practice, practice, practice.
@ Njoynlife, yeah, but sometimes its hard to confront a guy or girl friend and ask if they want to do that with you... lucky my guyfriend is totally open to that but sometimes it creeps a guy out so i wouldn't suggest that to any of your guyfriends..