Even though we all want to live in a perfect world, reality is that our world isn't perfect, so naturally there will be problems. A story without a problem is a pretty bland and boring story. Think up a problem for your main characters to face. Is one moving away? Did one cheat on the other? Do the parents not approve? Is one lover fatally sick? Part of a great teen romance is having the two people go to great risks to be with each other!