Any question answered...

My seatpost is getting stuck after I've inserted about half of it, the first half goes in without any trouble at all. What's up?

Seat tube is clear, nothing else in there and it isn't dented.

Is is an used post? Could be bent slightly. My mtb one did this. After 2yrs it was out by 5mm. Or it could be your seat tube, if someone's put a post in there with little inside the frame it may have put it out a bit.

Or it could be tapered.