Nah, relationships at that age are normal. However you probably are too young for serious relationships, or to think said relationships are going to last. It's when kids(and even teenagers) start flinging around words like 'love' where it gets silly. That's not to say you shouldn't feel bad after break-ups, you will--but to think at the age of 12 that the girl you were seeing was going to last forever is a bit far-fetched. Realize that the relationships you're experiencing now aren't relationships to mold your entire life around and you'll be fine.