If you look at the fact that you have a roof over your head, food to eat, that you are young and beautiful and live in a peaceful land, then no, you have nothing to be sad about. But the fact is, we are not only a physical body, we have souls too, and sometimes our souls get sick. If you break a leg you don’t just say ‘I have no reason to have a broken leg’ and ignore it; you seek help. It’s the same when your soul gets hurt. Don’t apologize for being sad.
Have you ever just looked at someone and thought, “I really love you”. They’re just talking or humming or watching a movie or reading a book or laughing or something, and there’s something about them in that moment that makes you think, “I just really love you”