it is not any kind of flea beetle I've seen -- all the ones I'm familiar with are at *least* that tiny but jet-black and super-shiny and rounded all over, like a seed almost.
there is no such thing as a baby june beetle... well, there is, but they are maggotty-caterpillary-lookin' grubs, not just smaller versions of the adults.
It
is a beetle of some sort, without question.
There are no beetles that bite people (well, except for the really big ones with obviously-bitecha-type mandibles that can give you somewhat of a pinch). If you're getting bit by something, it ain't this.
There are about fifty-seven kajillion kinds of beetles in the world, and proper identification requires a microscope to count antennal segments and how many segments in their toes and the details of how the bits of body architecture go together. So unless it is a common garden pest that people recognize -- and it doesn't ring any bells for me, for whatever that's worth -- you will never know what it is. But it doesn't matter, if your main issue is 'something's biting me'
Good luck, have fun,
Pat