What is White's odds in this situation?

Starting from move 42. I was playing on the Mac version of chess with difficulty = +3 moves ahead and somehow won this. I don't get how the computer didn't win.

Can any advanced players give me tips on how I played? I've been trying to get better and know I made some mistakes throughout as white.

Of course, white should lose. I don't know Macs but computers that can't see further than 3 moves don't care about things further out than that.

That's why the computer played without purpose and you were able to pick off those pawns and get a queen with so little trouble.

I didn't see any bad moves on your part but you were three pawns down with no passed pawns. Black should have let his pawn mass stay put and have gone after your queenside pawns. You would have not been been able to defend.

If you play a computer which is stronger, you will see that.

Yeah black should win from move 42. 2.e5 is not the best vs 1.e6 although World champion Steinitz liked it I think. 2.d4 is the simplest because after e5 the pawn is too prematurely advanced to protect properly so after f6 you have to go exf6. Then black recaptures and controls the centre better. 7.g4....really ugly move. Not sure what the idea was but it weakened your position horribly. Get your pieces out and castle before thinking of such pawn thrusts. Then you castled kingside behind that big weakness you created and as you saw your king was then in great danger because it was exposed to checks. Although black should win I thought from the losing position at move 42 you played quite tenaciously to keep fighting though, never resign!