Losing every tournament going in with best hand?

[Philo]

I have been going out in almost every tournament I play in with the best hand going in. The last four tourneys I have lost all-in with:

A-A pre-flop, lost to J-10.
A-J on the turn, board of A-10-A-9, lost to A-5.
A-K pre-flop, lost to K-Q.
A-J pre-flop, lost to A-10.

I have only been playing tourneys for about a month, but it seems like almost every time when I am the short stack heads-up I lose with these sorts of hands. It's maddening, because it seems so unlikely that I could lose almost every time all-in with clearly the best of it.

My question is, is this actually common? I know the losses are bad beats, but am I just missing the fact that these sorts of bad beats are common in tourneys when one goes all-in with the best hand?