Hi... i'm female and 15 years of age (if you need to know

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I just saw this last night, I had a little lump on my inner thigh right at the top of my left leg near my vagina, but not on it. It hurts just a little touching it, well, it doesn't hurt hurt, but I can feel it. And I can feel it slightly when I walk...
I sit down a lot at my computer... could it be some kind of 'bed sore'?
Does anyone know what it is? or have something like it?
I'm a bit reluctant about telling my mum or going to the doctors, because of where it is... this stuff easily embarrasses me

My mind keeps saying 'tumor' and it really scares me.
Edit: I've been reading round, could it be a Cyst? -- If so, is it ok just to leave it, or something?