This is a recipe for getting taken advantage of. Doing your best for someone else when they haven't earned it means they will always expect that for a low return. Have a job? Do what you were hired and paid for, and maybe a little extra, no more, no less. You rarely get "good boy points" for doing better than that. Save your best for what and who is important to you; actions you are passionate about, people you care about, things you want or need.

Do your best when it counts, save what energy you have for that.