What's wrong with me?

I'm an 18 year old guy, I have no attraction towards men but sometimes I do weird stuff when I'm horny sometimes like I've worn my sisters underwear and bras, sometimes my neighbors mom tans in a bikini so I would peek. I feel wrong doing it and idk what the hell is up I just get like this the odd time. Could this maybe be because my hormones are crazy or something or maybe because I'm shy and have never really talked or hung out with girls?