It's something to which everyone falls prey at one point or another. Me? I catch myself a few times a day. It's so easy to do, and maybe it's harmless. You think, "She's so pretty. Maybe if my hair was as straight as hers..." or "He just smiled at me. If only he'd ask me out..." or even, "Wow. I wish I had a cell phone like that..." The harm comes when you let it take over your life, when you let it stop you from being happy because you're too busy wishing about tomorrow instead of enjoying today. Today is your most precious resource, and if you waste it with your head in your hands obsessing over what ifs, you have no one but yourself to blame. Sometimes the if-onlys are hard to shake, but I find what helps me is taking your if-onlys and turning them around. "You have curly hair, and didn't you hear her complaining just the other day that her hair won't hold curls for an hour?" or "He actually smiled at you. Talk to him, and tell your heart to shut up for a few minutes." or "You have money to go to the movies with your friends this weekend because you're not paying an arm and a leg every month for a data plan on one of those fancy smartphones." I'm not saying this is by any means foolproof, and I'm not saying that it's going to be easy. All I'm saying is that it's going to be worth it in the end.