Question about ITIN and documents for proofs

I'm confused about the issue with ITINs. In a couple posts here, people are making them sound just as bad or worse than fake SS. Would the fact that I used an ITIN (with my name, given to me by the IRS) on my employment forms and to file my taxes be an issue? (technically I was self-employee the whole time, since in all my jobs I've just had my employers put me down as a 1099 subcontractor)

I also had a couple questions about some of the document proof we should be gathering. For one, I'm assuming that my MD DL would be enough of identification, or should I also see about getting a copy of my birth certificate? Also, since I just graduated this spring I have copies of my bachelors degree/transcript , but I should still contact my HS for those records, only those are valid? Lastly, I don't think I fully get the proof for the 5 year part, would simply showing something like my 2005 HS graduation records or some bank statement/taxes from 2007 be enough or do we need to somehow prove that we were constantly here from 2007-2012 (and how much proof are we talking about, like something per year? Or every single month statement?).

When I spoke to my Lawyer, he mentioned to have proof for every year for the past 5 years, and ever since I been looking for any documents that prove I was in the US in those years. However, I personally think my HS documents will suffice and utility bills, medical records, etc.

Also it is a bit insane if USCIS actually thinks we left to another country every year for the past 5 years and came back. So I think they will be a bit lenient when it comes to this requirement. Don't take my word for it, but something along those lines.

Itin ain't a problem