Is it normal that my female coworkers kept sexualizing me (m, was 17)?

So when I was 17, I had my first job; I didn't know what was normal or not in the workplace, so I just kept my head down and did my work to the best of my ability while remaining kind and cool-headed with coworkers. It was at a kind of "old-fashioned" candy store in my mid-sized city's downtown area. All of my coworkers were female; there was my middle-aged manager, two people in their mid-twenties, and another two who were slightly older than me.

So shortly after working there, I noticed that my coworkers felt very comfortable asking me or talking with me about certain...topics. Some of them would start to talk to me, completely unprompted, about things that always seemed to include graphic sexual content. I was asked by these same coworkers (and a few more) about once a month about if I was dating anyone or not, my reasons, etc.

The worst bit I can think of was when on a few occasions they made a few jokes about the size of my butt, though I didn't think much about it at the time. I've always kind of had a rather large one despite being a healthy body fat, and as such have kind of just been used to family and friends making jokes about it. They may have brushed a little too close to me for my liking while I was at a workstation they were passing once or twice too, but it was a bit of a cramped space. Some of them also kind of displayed some body language when I was sharing a shift with them that made me kind of uncomfortable (laying on tables, leaning very close to tell me something, etc) but it's also possible that was just how they normally acted. I know that I always felt uncomfortable around a lot of the coworkers who said or did these types of things, and wasn't very happy there.

I guess what I'm wondering is if this normal for a workplace, as well as if it was ever actual "sexual harassment?" Several years have passed and I left there quite a while back. I just don't feel comfortable saying as a guy that I was sexually harassed by adults as a minor by a bunch of adult women when no definitive physical harassment occurred? Also I'm not sure what red flags are in behavior etc, and don't want to downplay the harassment other people have faced by calling the bit of discomfort I've seen as "sexual harassment."

EDIT: To reiterate, I no longer work here. I was 17 and am now in my 20's living in a completely different city. Just wondering about a past experience.