I Walk 6 Miles A Day And Climb Several Steep Outdoor Staircases?

In this 100 degree heat though it's killing me. I also do several sets of situps. I am trying to drop 30 pounds by September though. Think I can with this regimen?
Update: Every been blocked before Ghost?

Cause You have now
Update 2: I barely eat at all

I eat like 400-600 calories a day
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