I just got minecraft on my pc, and no matter how many different combinations of different worlds I try to create, the game still drops me in from the sky onto a bunch of invisible blocks. I can break them and they block my movement, but they are invisible and there's just empty sky above me and below and all ways around. I don't know how to fix this or where to go next, so if someone could offer some guidance that would be greatly appreciated.
Added (1). I have 8 gigs of RAM and an r7970 black edition. That's not the problem, but thanks for your answer