I dont mean to sound cynical, but playing on that long in a lost position is rude. If you're looking to learn you can ask him for a post-mortem, but resign if there's no escape.
Your biggest mistakes were:
9, 19, 22 (over-aggresive), 23, 24, 33, 35, 46 (Qb4+ kept you comptetive)
Here is game, could anyone help me where i made mistakes? I think i did pretty good, saying he was a full 300-400 points higher and i lasted about 100 moves.