What it is like to be married?I mean do guys change after marriage and what does it feel like 2 be married?

I am a 23 yr old girl.My boyfriend whom I have been dating for 3 months,has proposed marriage to me.I am suddenly scared.I mean Does marriage means a lot of sacrifices?Do women have to compromise with their careers to make marriage successful?What did you all feel about your married life?Is it any different than a relationship before marriage?