untill its worth / not invain
"Till it's worth it" is what you'd put. "Till" is a word that means "until." It's not a contraction of "until," so there's no apostrophe beforehand. It's its own word. Even Shakespeare used it.
"Let me stand here till thou remember."
-Romeo (Romeo and Juliette by William Shakespeare, Act 2, Scene 2)
Also, "invain" isn't a word. It's "in vain."
Finally, "make it worth" is nonsense. Don't get that tattooed on you. You could put "Make it worth it." You could also put "Make it worthwhile," but that doesn't seem very tattoo-y.