If you mean your parents, they have no control over you if you are over 18.
If you mean your spouse and kids, if they do not support you in your desires you may as well forget it. Either that or get a divorce.
But either way you can not become a NC officer in the Army unless you get a four year Bachelors degree in nursing. So you got some time to deal with their views so do not push the issue until you actually graduate college.