If boycotting prom is a trend, I have not heard of it. The last I heard, prom is still an important night for teenagers all across America. Perhaps your school is unique for some reason. Was someone there accused of rape? Generally speaking, only a small percentage of boys are socially awkward enough to blame all young women for their emotional problems and thus, choose to avoid all social situations. Most boys want to date and form relationships. That being said, it is important for young women to be very careful about who she chooses to spend her time with. There is a dangerous group out there called Incels. You probably won't run in to any, but just be aware. When your parents caution you about certain matters, they do it to protect you because they've been around long enough to have figured out a few things.
But at this juncture, male-female relationships are still very much alive. I work with young women who have boyfriends with whom they feel comfortable and happy; their relationships appear to be healthy and reciprocal. You will have the same, one day soon when the time is right.
If it makes you feel any better, I almost didn't get asked out to prom. Honestly, I think most guys are kind of intimidated by pretty girls. In my case, I was very quiet and lady-like. That may have made things more difficult for boys. They had no idea what I was thinking. But, in the long run, that way of "being" has worked for me really well. ;)
So don't worry too much. Time is on your side, as well as your sister's.