If I tell the truth on my SF-86, but didn't tell the truth at MEPS and explain to the Security Office why...?

i didn't tell the truth at MEPS, will he go and tell the military so I get a Fraudulent Enlistment discharge? Because I have seen many things that say as long as you are COMPLETELY honest on the SF-86 you will most likely not be denied a clearance. Thanks and 10 points best answer!