England lost not because they were weaker than Croatia but because Croatia was better than them, a Huge difference....let's not forget that Croatia is one of the worlds top national teams and they reached the Semi-finals in France 98 if it wasn't for the home advantage of the French they'd have probably been the 98 champions....so hats off fore the Croats...good luck.
P.S (I still support England and would never give up)