I've been reading some stuff about it and I'm just even more confused than when I started. Christmas has possibly no connection to his birth as he might've been born in summertime. Also the year confuses me even more as some say he could have been born in year 2 BC (Before Christ). As a side question, what proof do we have that he was actually real?
what proof do we have that he was actually real?
The general historical consensus is that there was a historical Jesus who existed, as expanded on by this section of the FAQ. Whether or not this person actually did any of the miracles ascribed to him is beyond the purview of history; that's the bailiwick of the Theology Department over in the building on the far side of the quad.
Also the year confuses me
It confuses everyone who tries to get into that little tangle. u/J-Force has a fuller explanation of why.