Marijuana charge

i think in this case it means you have a clean slate -- but if you get caught smoking while serving, they'll kick you out.

otherwise they'd have a tough time finding volunteers who have never done drugs...

I don't know all of the legalities involved, however I tend to agree with Region on the practicalities.
I remember when the recruiters were after me out of high school (2000) they made a big production about asking of prior drug use.
I would say "no". The would say are you SURE!!! There would be several rounds of this, and from multiple persons.
I actually hadn't used drugs at that time, but they had me half convinced I had.
I wouldn't suggest lying to your recruiter. Just be honest. Tell them about the past issue, and explain how you have moved on. Got treatment and got you GED.
If they catch you lying they can use it to deny you military benefits later (GI bill, medical coverage, retirement, etc).

I have 2 brothers who were in the military (Army, Navy). My girlfriend served 8 years in the Army Reserves. It is a system. If you want to get into it, you should really learn the rules. This is so you don't get taken advantage of there. The military has many benefits, just don't walk into it blindly.

Thank you Matt. I'm just really scared about the fact that I don't know anything and although i'm being honest with my recruiter, everyone is telling me recruiters lie and lie. I'm also thinking that since I only have a GED, maybe if I do a few semesters of college, they'll overlook all this, because i'm also being told that at this time, I can't get into active duty with only a GED, and with that And the drug charge and all, I feel like I'm losing all hope with this.

Go to college. Get a real career. Give the military a pass, seriously. They don't give a damn about their vets, especially wounded vets. Look around at the homeless in your city. That should give you an idea of what to expect.

I have talked this over with my girlfriend who is still in touch with many other soldiers who are still in active duty. The last she knew the Army was at full capacity, because of this the Army is less likely to give out waivers for things like the (marijuana, and GED). She thinks that if you want to get into the military you should talk to lots of different recruiters (Army, Navy, Air Force, Marines). In order of preference [I may get a lot of criticism for this] I would rate them 1.Air Force, 2.Navy, 3.Army, 4.Marines. That rating is based on average conditions for enlisted people.
There will be differences based on your MOS (military occupational specialty) ie. your job in the military.
Regarding recruiters lying, I would have to say, I wouldn't be surprised.
Get everything they promise in writing. Save it. Talk to other enlisted people (other than the recruiters). They will be more likely to be honest with you.

If at all possible see if you can get into an ROTC program. This will depend on you being accepted into a military branch and into a college. That in my opinion is ideal. That way when you do enter into service after college you will be an officer (better jobs/better treatment).

Celie is also right. You don't have to join the military. You may be eligible for financial aid or student loans to go to college. If you go to any local community college they will have advisers with more information on that possibility.