i ended up a pawn up in this endgame. im not sure if i could of won it because his rook was blocking my extra pawn and my extra pawn and king were forced on the same rank. 

White should have pressed for a win even if the likely outcome is a draw.

Why agree to a draw in this position?

well, ghostofmaroczy,   what are the moves that would win?  since you ask:  why agree to a draw?.   Most players aren't into beating their heads on a wall, when the position is a theoretical draw and the moves to get there are fairly obvious.

Fritz shows it as a draw, although white is a full pawn ahead, forcefully making any progress isn't possible, is it?