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Remove the black piece, press the block and square it, then measure the black to be sure both blocks are the same size and sew together. I like the look of your block. You have many interesting ideas given here. By following some/most you will have a very nice quilt. And no your are NOT a failure.
My suggestion, first of all, is remove the black block. Does not belong there at all. Secondly, remove the top row of fabric which has what looks like red in it and redo that row with more of the fabrics from below and see what it looks like then, but add either a matching pink block or a white block to it rather than the black. It is a mistake. Mistakes can be fixed so that they are no longer mistakes.