lump on breast

Okay so I'm kind of confused. I know that when you have a lump on your breast you should check it out but I always thought that a lump like is normal, I don't know how to explain it. Like it doesn't hurt, it doesn't move, it's always been like that and I never thought that it was bad but some other girl asked about hers and people told her to get it checked, is it normal what I have or not?