Wow... this is like de ja vu for me. I've been down this road at least 3 times now
To answer you question, most of the time there is no real easy, cheap fix with body work.
Now I'm assuming this is a "plastic" bumper. I will tell you, I believe it was daughter #2 that did the same thing (only it was sister's van & not a wall) and left a pretty bad looking round round dent in the bumper.....This was during the summer, went out on one 100+ day & the dent had popped out due to the heat & all you could see was 2 little scratches. I don't know what your dent looks like but some can be popped out with a suction cup or combination of cold & heat...
hope this helps & don't get down on yourself
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PS... you're grounded