Is there a way to get away form this hand?

Just came off of a 5th place live tounemnet win and the next day a 7th place Online touney win, feeling confindent entered another event the next day a was out in the first 10 min.

I hold A5 in the BB no raises

Flop 525 I bet $325 button calls
Turn is an 8 I bet $325 button calls
river is a 2 I bet all in button calls
Button wins with Pocket 8's

I probably should not have bet all in on the river because I had him on a weaker 5 and it would be a chop, but it was early and you guys no how some freaks over play AK,AQ, ect. with a low card board. I don't think I made any huge errors but tell me how to lay this down or not go broke.

Thanks folks.