Is this love or are we out of our minds?

Okay for some reason. Some people may consider it as wrong for an older female to like a younger male. As for the both of us, we’re just fine with our relationship. Btw I’m just 13 on January and he’s like somewhere around 11. He’s not like other kids his age, I believe he’s way mature. I don’t know why but we came to like one another after a few days when his sister and me started hanging out together. Not only is he my friend’s brother but also my brother’s best friend. It’s weird but it’s just the way it is. I’m always comfortable around him unlike with my previous boyfriend. He can also comfort me so much, that I never want to leave his arms. Height doesn’t really matter but I might as well say it, he’s like a couple of centimeters or inches away meaning he’s taller than me. For some reason since he’ s also connected to the people around me, it’s hard to be alone together. We always joke around all the time and we enjoy having each other. Not but not least he seems to know me well, by finishing off my sentences, without me having to say a thing when I lost my thought. Even so, he say he still wants to get to know me better and I do also. So is this love or we’re just out of our minds? and can you tell if he really loves me or not?