Repressed memory of sexual abuse?

lately ive started to havethese feelings that i may have been sexually abused when i was very young but cant remember. i feel really stupid for even asking this question especially bc it may have never happened in the 1st place. i dont want to talk to anyone about this for fear of people thinking im nuts.when i was younger my older brother lived with us but he ended up leaving and i hardly see him anymore maybe evry few years he will visit but thats it. my older sister had told me that he had been on drugs while living with us and he had problems. when i was younger my mom had asked me if i had ever been touched and i said no bc i never remembered anything. my sister has asked me if he had ever done anything to me or made me uncomfortable. as a child i never liked being touched at all even just someone brushing against me. i had nightmares where i would wake up screaming at night. i was very shy i wouldnt even let my mom see me changing. i can hardly remember anything from before the age of 6 or 7.