Your understanding of DNA is wrong.
DNA recombines at meiosis when your father's sperm met your mother's egg .
DNA keeps replicating from one cell to the next via mitosis.
DNA is used to make proteins like hemoglobin which captures oxygen and carbon dioxide, like membrane proteins which guard the passage of material in and out of cells, like antibodies which regulate immunity, like DNA polymerase which replicates DNA, like keratin in your hair, like actin and myosin which control muscle contraction and relaxation, like everything needed to sustain life.
DNA also makes mRNA, and it also make ribosomal RNA, and it also makes tRNA which is all important for biological functions.