Did my very first AG brew today ,however not very sucessfully. Sparged with 5gall of 70c water ended up with 2gall of wort which makes it a very expensive pint.To cut things short where did I go wrong.Must get things sorted for next attempt.

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I did 3kg Pale malt,250g crystal malt and mashed for 1hr 15 mins.
Sparged with 5gall 0f water at 70c,
Boiled for a total of 90mins (vigorously)
Cooled with chiller and ended up with 2 gallon of wort
Mash tun is a Hop and grape cool box