How do I masterbate ? ( btw's i'm a girl )

I get aromatherapy and rub it in a u shape around the outside of my clit then I get arouses by watching porn then start Cumming

Start by laying down on your bed and spread out your legs and slowly move one hand down your p***y and use the other to touch your boobs, then use the hand that is in your p***y to start slowly rubbing it on the cilt(every now and again stick your 2 fingers dep into it. With the hand that is touching your boobs start rubbing and grabbing then, you can eaven play with your niples.
Whilst you are doing this think of something sexual that turns you on or try watching porn, find something you find turns you on, I'm lesbian so I like girls and my favourite thing to fantasise about is spanking.

Watching porn is the worst thing to do to get turned on simply because you can rewire your brain so nothing else but porn works, it's the same with guys that use porn to gain erections or ejaculate nothing else but porn will work after some time using it!

I know you are older now, and hope you have found some answers, but...

No pun intended, but if you stick with it, these things come in time. The brain is really good at figuring out what feels good, and losing what doesn't work so well. Sex feels good for a reason; we are SUPPOSED to like it. So, like anything that we are driven to do again and again, we LEARN how to make it work better over time. You might consider shifting your focus away from your clitoris though, and onto somewhere else beyond the obvious -- nipples, belly, inner thighs. Have you slipped a finger or two inside yourself to massage your G-Spot? It is the rough-feeling place on the upper inside of your vagina, kind of just "behind" your clitoris. It sort of feels like the roof of your mouth. This rough spot is meant to excite both you and your lover (Nature is assuming it's a male here) by stimulating the coronal ridge of his penis to bring him to orgasm (to ejaculate his sperm) inside you. But you can massage it yourself to lovely, intense effect, and bring yourself to orgasm from this alone. In concert with your clit and nipples etc., you should be able to get there on a regular basis.

But remember, your orgasm is not just driven by your clit (or your nipples, your belly button, your anus, your mouth -- whatever). In short, the physical sensations you create with your fingers are only a PART of what goes into your orgasm. Most of it is actually in your head. Your BRAIN, your MIND really drives your body when it comes to orgasms. The brain takes the sensations you create and mixes them with memories, fantasies, images and other stuff in your mind to begin the process that culminates in orgasm. A lot has been written about that, here and elsewhere, but it bears repeating. Orgasm is a delicate dance you do with yourself. Lots of things go into making it happen, including strong feelings of love for a partner. Lots of things can also get in the way -- subconscious fear of punishment, thoughts of being "bad", etc., even desires for a particular, absent partner can distract you or detract from the pleasure you want and deserve. You need to give yourself  PERMISSION -- the freedom -- to have and enjoy the orgasm(s) you deserve.

So, keep exploring the sensations you can create, and Good Luck!