[pastelfukuro]

So I've found this person online and I've really enjoyed my time with him. He's really nice to be around and he's not sketchy.
But when I first met him I was rather concerned about revealing my age to him since he was a 15 year old and I'm a 12 year old. I'm quite mature for my age though, so when he and his friends met me they all thought I was 14. When they started jumping to conclusions we were both shipped with each other by his friends, which led me to gradually develop some feelings for him. At that point I was really nervous to tell him my age, but I finally got the guts to do it. He was a little surprised but his view of me didn't change which I was quite happy about.
It turns out that he has feelings for me. We discussed it and I was explaining that this realationship would probably be judged a lot and be quite creepy in other people's perspective. I ended the subject by saying that I'd decide in the next couple days, but he's now asking for an answer.
I've been trying to decide for the last 3 days and I've had no luck. Really, I want to give in and be with him but at the same time I feel as though this is wrong. I understand that realationships usually matter the most on how mature each partner is, and although I can guarantee you that we are both equally mature, I'm still a little concerned about our age gap. Can someone please help me find an answer? I apologize about how rushed this is. I would've explained in greater detail but unfortunately I don't have the time.