La vida es una lucha.
Ain't is not proper, and thus will not precisely translate. Vida! No es fácil! is as close as you can get, and it means Life! It is not easy!
La vida is the life in spanish.
Lleno de vida is the best way to say "full of life" in Spanish.
'La vida contigo' is the Spanish equivalent of "Life with you".
You can say "la vida".
your life = tu vida
In Spanish, to say, "You are my life," you say, "Tu eres mi vida." For example, if you want to use it in a sentence you can say, "Tu eres mi vida, y me amor." That means, "You are my life and my love."
Mi amor por la vida is "My love for life" in Spanish.
Mi vida.
La Vida.
Que vida!
A la vida.