Addicted to sex

Hi I have the problem that whenever I see a hot girl I just have to f**k her and yer I am a lesbian I honestly even tried to come on to my best friend once and when I can't find a woman for the night I just use my fingers or my vibrator is it normal to crave sex so much I honestly can't think about anyhing else does anyone else have this problem btw I'm actually masturbating as i write this sorry but I have a problem