I don't know what it is that you struggle with, but here are a few possibilities. Everyone does stuff like that in their sophomore year. You want to be part of the in-crowd, but you've been taught that this is not the way to treat the body or the mind. Or you're a high school girl whose boyfriend is asking her to go farther than you want to. Or honor that which is sacred.
Temptation is everywhere.
In a thousand ways, we are all confronted with the testing of our faith as we seek to do God's will. Giving into temptation is easy. It is in resisting it that we see how powerful it really is, and also, how powerful God's presence within us can be. The forty days of Lent offer us an opportunity to be alert to the temptations in our lives, to recognize our sin, and repent. And that is very good news.