I'm am easily excited

Is it normal that i'm easily excited when the mood gets slightly sexual?
For some reason in time i noticed instead of it being harder to get an erection it has gotten easier. I am kind of embarassed of it cause even when i kiss a chick or sometimes even talking dirty i noticed i start to get arroused. I can't help but think of everything i want to do and it overcomes me.
Is this normal has this happened to anyone else? I'm an atractive guy and chicks tell me they want me all the time but i'm kinda embarassed about my situation resulting in lack of sex in the past few years, and yes it has been affecting me for a few years. i used to get laid all the time but somehow this started hapening and i've been single.