Hi - a gap year can be a great thing -- allowing you time to learn about yourself, explore, give back, and gain experiences. You can also consider applying to a college and requesting a "deferment" for a year once you get in -- that way they'll "hold your spot." A gap year can be especially rewarding if you use the time volunteering in a service role, like the Peace Corps (peacecorpsconnect.org) or the Service Year Alliance (https://serviceyear.org/).
Taking a year off doesn't have to have a negative impact. It is more about how you do in college, getting your degree and being able to articulate your story of why you took the time off. Many individuals take the time so it is more of can you speak to what you did, what did you learn, did the time help you determine your major or the area you wish to work in for a career. Good luck!