@Britsimon and @Sm1smom , I appreciate your help!! I really do. And it seems like both of you are strognly recommending to submit DS260. My thoughts were: if I give less info then less questions I'll be asked on interview (because form ds260 has so many questions!). For example "Address" part. To be honest I don't even remember the exact years of living on particular addresses - I think I have changed 20 times since my age of 16. So if I don't remember, should I just guess? So that was the reason I didn't want to submit the Form 260. Do you still think I should submit it even I'm not sure in some of my answers to question in that form?
Your plan regarding giving "less info" could end up being termed as withholding of pertinent information, which is not a good idea.
You may not know the exact day/months in which you lived in certain places, but I'm sure you can come up with the year if you give it some deep thoughts. You can guesstimate the day/month.
So a hypothetical situation (not known to have happened to anyone, but nonetheless): if asked why is there no DS260 form for you, what will be your response? You didn't know you were supposed to submit one, or you knew but didn't submit it because you're trying to avoid being asked a lot of questions?
My take is better safe than sorry. Be upfront, do the right thing and not look for ways of being asked "less questions"