I'm mad about the sentencing.
Where did the sentence come from?
It came from the judge that I was in court with
Being sentenced for something you did is discouraging, but if you break the law then it is assumed you will pay the price eventually.  You could fight it with your lawyer and try to get it dropped.  You really don't have much to lose by trying, but if you don't try then you won't ever find out if you can get a lower sentence and would end up doing the whole time you are sentenced for.
Well to be honest, I deserved the sentence that I got.
Well, in that case, it seems like you are ready to repent for the bad things that you have done, and that only seems fair to me.  You do have the right to appeal your sentence if you ever decide to, but for now, I guess there is nothing for me to do but to hope that you can keep out of any more trouble.