Don't beat yourself up about it. It is a smart decision to take the test when you're more ready and I think it will pay off for you. Thanks, good luck to you too.
I was looking around to find advice given on being prepared for the LSAT (also with the assumption that a gd LSAT score will be achieved) vs trying to get in via early decision.
Check what the school that you are mainly interested in says about this. For example Harvard has clearly said that if you apply late you will get the decision later but your changes of getting in are the same.
We're here for you, whatever your decision is: venting, settling with score or persevering.. Though we'd be happier with persevering. And we know you will.