Attempted to cut my own hair

Sides are too short compared to the back (unless it's the lighting/your hair is thinner on the sides)

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I might be wrong, but it doesn't look like you went in with a plan when you started cutting. From the looks of it, you've sectioned your hair to be longer at the top plain and shorter under that plain, much like a default undercut. I've drawn a line in my attatched picture, and under that line, everything should pretty much be short and, more importantly, the same length. You should go over with a buzzer set to a certain length and just go over and over the same places until you feel everything's the same length. Since you're cutting yourself, I don't suggest that you make the the bottom section of the back of your head shorter than e.g. your sides, as this is really hard to do alone, along with the fact that it isn't needed.
The top of your head should be longer than the rest, and it should, as with the back and the sides, be the same length all over.
If you don't want a version of an undercut, you should really just buzz EVERYTHING off to be the same length, but I don't think that ever looks good on anyone except the rare few.
It's hard to make a good finish to curly hair, but I nevertheless suggest you at least just make sure that the sides and the back is the exact same length by going over with a buzzer that's set on a static length. good luck have fun.
A tip for future threads like this would be to also post a picture the front of your head.

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Compare this photo to original.
You want the parts where I drew red lines to be aggressively tapered. It will be hard to do this alone if you're new to cutting your hair. Best advice is to create a line with your finger/comb where the red lines are and use a no guard clipper to shape the back and sides. also you should be cutting more off the back like another anon said. The top is too hard to tell at this angle but it looks fucked up desu. Message me for anymore info if it's unclear.

it doesn't look like you cut it at all
go and get it cut my dude