People change. God doesn't.
The first thing to change is your heart. God does that - bringing you to life in Him.
After that, as Christians, we should be consciously striving to live holy lives. God is eternally changeless - so we look to the life of Christ to see what our lives should be like.
Are you, overall, changing to be more like Christ or more like the world? Moving towards godliness and wisdom or towards sinfulness and folly?
When you're making a choice, ask yourself "Is this changing me and the world around me for better or worse?".
We can't change everything. We shouldn't waste our energy trying to put an end to the annoying habits of family members. And we can't change things without His sustaining, keeping, guiding, strengthening hand of mercy.
Nevertheless, we must do our very best.
Change and decay in all around I see
O Thou Who changest not, abide with me. ~H.F. Lyte