Everything is relative, really. If you are a triathlete or swimmer/runner, those times are quite respectable. If you are competing in just swimming events, you won't win Nationals, but you know, who cares? What are your goals? If you were a non-swimmer who just recently got into swimming a few years ago, then 1:20 is pretty good for 100 meters. I am a former swimmer who got back into swimming as an adult after a long layoff, and my masters' best is 1:10 and change, but I'm in my 60s. You didn't say how old you are, so that is another factor.
Everything is relative, really. If you are a triathlete or swimmer/runner, those times are quite respectable. If you are competing in just swimming events, you won't win Nationals, but you know, who cares? What are your goals? If you were a non-swimmer who just recently got into swimming a few years ago, then 1:20 is pretty good for 100 meters. I am a former swimmer who got back into swimming as an adult after a long layoff, and my masters' best is 1:10 and change, but I'm in my 60s. You didn't say how old you are, so that is another factor.