To add to both of their comments... they're actually trying to help you.
No offense but boots of swiftness, doran's ring, and iceborn gauntlets on blitz is an extremely poor build.
Blue sightstone should be your first item, then more than likely a Talisman on Blitz, depending how your team is doing / the enemy team comp.
A build guide wouldn't hurt ya, buddy.
Your thresh game linked below wasn't so bad. You had the least deaths on your team, and a solid number of assists. Mikaels and Locket were good picks against that enemy comp, assuming you used the item actives.