I'd say you played the best you can against a team which is technically superior.
Away from home on a ground they have always underperformed Barca will be happy with the draw.
Chelski were unfortunate not to bag a second but on to the second leg.
Barca will be playing a far more offensive game there and you will have to hit them hard on the break with pace and accuracy to win.
I can't see it happening with the frontline of lumbering poverty you have.
Only Morata could do it and he just doesn't look interested.