Retired university professor here. Today as compared with the 70s a gap year between HS/College of college/ grad school/med school, etc is not atypical at all.. If HS to college and you currently have no clue what direction to take, then nothing at all to take some time to find your direction. However would highly recommend that you set some goals up of what you are going to do. A couple good things would be to first be sure you get some type of employment that gives you and income and keeps you on a daily/weekly routine. If able to take a couple courses at a community college or local college/university to get your feet wet, another great idea. Be sure to take general education stuff, such as Writing/English 101 or a College Math class that would transfer to a 4 year school and not go to waste.
Explore and learn about you and when you find your direction go for it. Better to be 20 and starting university work with a clear direction and major vs 18 and absolutely no idea what you want.
Also. If able to take some time and travel, especially abroad. Do it. You learn a lot about you, the world and how things are aside from your local neighbourhood. [and when you go to college, yes, take a semester abroad and study somewhere else...it will have a profound effect on you that lasts your entire life..all for the better].
Good luck
Cheers