Older then my age

je
So im 22.. I have two kids and thinking about a 3rd and final.. I have been married to my high school sweet heart since i was 18. Had my first son shortly before i turned 20. No regrets whatsoever for both my sons. So we're thinking we want to try for the last one pretty soon but our family and friends keep making comments every time i mention something off or they catch me congratulating someone else on a new baby like "better not have another baby." And similar things. Shouldn't that be my decision?