To do what must be done, sacrifices must be made. When you have a goal in sight, it becomes your be all and end all and while you need to take a break sometimes to refocus and realign your goals with your current situation, sacrifices to your social life (which will pretty much become non existent) an your bank balance will be made.
People will make demands of you on your time, they'll complain that you're never available, they'll complain that you've become someone else, someone self-obsessed (rather than the truth of your unwavering focus on the pursuit of success, not on your self) but you should never apologise for your ambitions, never apologise for having a dream so big that it requires sacrifice because the mere fact that you are willing to make such sacrifices is evidence that you are on the right path, that you have what it takes to succeed.
Never apologise for reveling in your success either - if you've achieved what you set out to do, you're entitled to celebrate your success. Achieving a goal is one of the most satisfying and motivating things you can ever do.
Your focus, your determination, your success are all powerful forces that should never be diminished nor apologised for. You are extraordinary. Harness your power, focus it and achieve what you set out to do without regret, without apology and without ever giving in to sway of 'what you're supposed to do'.