Yeah, I think he is. I think he may already be fully aware of this at 13. For some reason, I feel like his family is also aware. This kid always seems to be giving a hidden message. Listen to his new single. He really does have many effeminate mannerisms. Ellen seems obsessed with this kid. I honestly think part of the obsession stems from her knowing/guessing/suspecting he's gay and she's trying to create this "safe" life for him by trying to get him enough self-confidence from success that he won't be hurt too badly by people who will put him down for being gay.
The shots shown of girls watching him sing on Ellen, at school, and in his music video were set up, obviously. It always looks incredibly forced and everyone taking part looks uncomfortable. So, I wouldn't use his "female groupies" as evidence of him being straight. I think the way they set up shots with girls surrounding him is so weird, like he and his advisers felt this needed to be done to project some sort of "rock star"image.