If you've already consulted with an attorney, there's nothing further to add from a legal standpoint.

It sounds like you've had a lot of incidents. At this stage, what you absolutely need is a spotless record and proof that your past is indeed behind you; prove it by not getting another infraction for anything. Don't even clip your toe nails in public (don't do that anyway).

The best way to address these things is to get a solid work history between you and those events; show that employers have been vetting you, testing you, and using you until you have the qualifications to seek the jobs you want down the line. At that point, your early history won't be nearly the issue that it is presently.

At the moment, you're not qualified to apply to a major airline, so the issue is irrelevant as to how your past affects you. Bear in mind that major airlines have plenty of competition and no shortage of applicants. It's not just what the airlines want to see; it's what you're up against competitively. There are published hiring minimums, there are preferred minimums, and then there is what you need to compete with every other applicant on a given day. If other applicants are sporting masters degrees and plenty of turbojet command experience and a spotless record, that's the standard you'll face that day.

A lot of people have had less than stellar histories behind them; what they've learned from that experience and what they've proven themselves to be in the time since is an important factor in determining their future.