Open Question: why do i get aroused out of nothing all the time?

am a single girl, 30. i feel so aroused at the simplest imagination. my problem is that i even get aroused at hearing or reading about marriage, rape,'s so scary! is this high sensitivity due to masturbabtion? or is it because once a women understands & recognizes her sexual needs, she feels turned on all the time? i never visited a doctor for this issue, it's so embarrassing. Besides, the last time i visited a male doctor, he touched my breasts for the examination & it made me feel worse.....i was trembling & i don't know how to describe it... plz i need serious replies namely from older females.