Those who have experienced great suffering must win in life and become happy. If you’re always losing and miserable, then you are not practicing Nichiren Buddhism correctly. You are not following the true path in life. Buddhism teaches the means by which the sad can become happy and the happy become happier still. That is the reason for our practice.
Your character is determined by how you challenge yourself, and how you wrestle with your problems, in a way that is unique to you. This is how character is polished and becomes diamond-like.