@fldoctorgirl is definitely correct.
I took 30 credits at a community college. Failed so many of them that I couldn't go to my new University as a transfer student and so my counselor said I didn't have to transfer from my old classes if I didn't want, since it wouldn't really affect anything since I had to retake it. Seems kind of weird to me, but I basically started fresh at a new Institution, still had to include that other school on my application and into my GPA calculations, even though the university that I got my degree from didn't have it on their records or in their GPA calculations, so it definitely isn't just the GPA calculations as according to you are undergraduate Institution. Also, some schools do the numbers slightly different, like one place might have a B+ at 8 3.4 instead of a 3.3 for example or they might do grade replacement for your GPA. I realize that my situation is different, I'm just saying if you took a class that was for college credit, it should be recorded as such on aacomas, not just whatever the final tally was from your undergrad Institution.
OP I did the math, and assuming that you had a 120 credits at a 2.5, you would need 60 more credits at a 4.0 to get over a 3.0. Now when you said a hundred and 20 credits I don't know if that factored in the 18 that you had in high school or not, and those are obviously slightly rounded numbers to that 2.5, but you get the idea. 2 years, taking 2 15 credit semesters a year would get you there if you didn't get a single A-. Or like others have suggested, maybe an SMP that is only one year long or something, but I know some of those have cut-offs to but I don't know in what range. Podiatry is a super legit path to consider as well if you don't feel like putting in two more years. I was in your position at 24, or pretty similar. I went to seven more semesters full time and got a 3.9+ over a hundred more credits, did well enough on the MCAT, ended up at a 3.1, got 10 interview invites to DO schools this cycle. It sucked, thanks to me from 10 years ago, so I know the feeling, but if it's the absolute only thing you want you can do it it'll just take a long time. I definitely don't suggest what I did to everyone. But there are options. And yes not every school has a hard 3.0 cut off, but a lot of schools do. So you got some thinking to do about how much work you want to put in for it before you even get to the start line that is med school. Something like Podiatry could get you to a place where you might be just as happy but a lot sooner, it'd be worth a shadow.