You have received excellent advice. I just want to add, don't be so hard on yourself. You are in very good company, and it has nothing to do with being a new quilter.
As has been said, we all do this from time to time, and you will probably do it again now and then. No head banging and name calling required; just take it in stride. And just wait till you cut a whole stack of squares for a quilt wrong, lol. Sometimes there is no patching, sometimes it just becomes a creative design opportunity. Embrace those times too, you just might LOVE the new pattern you come up with.
Smiles and hugssssss...... remember we are quilting because we love it and it's FUN!