I lied about MJ use, what should I do?

I used a delta 8 weed vape my sophomore year of high school twice. I didn’t tell my recruiter and than omitted it on sf86 to keep story consistent. I booked an intel job requiring TS. I am going to basic training in 60 days, and have my 2nd interview tomorrow. I want to be truthful, but I don’t know what the repercussions could be. Would I lose my job? Be kicked out of dep? If I have to take it to the grave I will.

How should I go about this? Any input is greatly appreciated.

how long ago was sophomore year?

coming up on 3 years