Most teens don't want to put anything up there because it hurts, even tampons hurt as a virgin especially with 0 lube. I never liked regular dildos, most women do not orgasm through penetration. So I would say they are messing with you. I've had guys ask me if I ever experimented with pencils or rulers because if they were a girl they would do it. No, wtf only guys think women are like this.
I'm female and bi and it is definitely noticeable when someone is staring at my chest and it is very uncomfortable. When I was younger there were certain guys that rarely looked me in my face and were just looking at my chest the whole time. I asked other girls about it and they agreed they too felt them gazing at their chests and it was really uncomfortable and off-putting for them as well. If you wanna help then tell them discreetly to tighten their bra straps. Otherwise I don't find it acceptable to stare at a woman's chest. A glance maybe but you should really be looking at their faces. People are not meat or eye candy, don't objectify them, just remember the person they are inside. There may be women ok with it and like flaunting it but that's not been my personal experience.