There is a right time in a conversation to discuss certain topics. Although once you agree and commit, to go back later and try to renegotiate may put you in a bad light. Learn to time things properly. I encourage you to step away and reflect, analyze, and discuss your desires, dreams, and wishes with those closest to you. It will help you not make an impulse based decision. After all, it's the right thing to do and it models the way for others.