If you find that you are forcing yourself or uncomfortably changing your own ideas, choices, values, morals principles, or anything that makes you you just for the sake of pleasing or making something work, then that compromise and sacrifice is not worth it. That compromise and sacrifice is so destructive and damaging yet blinding because you don't know how much of yourself you are losing.
There are better ways. Grow instead of change. Make sure when you make these choices that your part of the equation isn't less or smaller. Will you become a better person because of it? A person you'll be confident in? A person you yourself can support?
That doesn't mean that you can't make selfless sacrifices at all for the person you love. There will always be sacrifices in relationships. But as with your battles, choose your sacrifices.