is uni necessary? UCAS

Do you still have to do a UCAS application if you don’t want to uni? My teacher keeps harassing me about doing an application even though i’ve said that I don’t want to go to uni, but do i still need to it? Also how important is uni because my teacher keeps going on about me applying to a uni or degree course but i’m uninterested. She keeps asking about what i want to do after a levels and I want to and have that i just want to work, but she seems to have a problem with that and won’t except it as my answer and says that it’s not a good enough option and insists of me applying to uni. I need help because i don’t know what to say to her and should i just apply to uni even though there’s no chance of me wanting to go?