Do you believe aliens exsist?

Please give me your opition on this question. What I think is that during the big bang it released molecules into the universe which cause planets to form though ages and soon the molecules somehow became DNA and landed in some land masses and soon DNA formed single cell organisms and well animals form but I believe there was DNA spreadig to other planets other then earth and maybe in a galaxies we haven't found has water and oxygen needed for Survival and well the same thing happen on that planet and a alien species we haven't found was form and there more advance then us. But that's what I think tell me what you think about extraterrestrial life. Thank you for reading if you didn't please do.