Is my friendship normal?

Ok, so to just get everything out of the way. We are both in highschool, he's a year older than me, I'm a female and he's male. We have only known each other for like at least 4-5 months? Or maybe more? I don't really know since I just met him this school year. We know each other really well, like really well, but I'll get into that later.
So on to the question. I'm pretty sure that this isn't a normal friendship, but I just wanted to ask this site, because it's full of critical people haha. Anyways, we haven't known each other for long, but we like already know each other like kind of a more than a best friends kind of way, I guess? I say this because, we both tell each other like really deep secrets some examples are; he knows I'm into Master and Pet, I know he likes sexting other guys, he knows I am sexually attracted to one of my big time crushes at school, I know he likes calling his partners (guys he sext) "Daddy" etc. basically really deep shit that even y best friend for four years don't know. (And those are just the things that come to my head). He always punches me in the boob. I try to crotch shot him, but never works out,...and recently...he basically grabbed my boob at lunch?...He just grabbed it and said "squish". I just punched him.
Basically, We know more than what we should know, and in your opinion is this a good or bad friendship? (Healthy or un-healthy?).
I personally like our friendship,because I feel really comfortable telling him stuff, even more than my four year friend anyways, in YOUR opinion is it a healthy or un healthy opinion??