The poster above me is right, your class rank is quite high considering your GPA. Can you give some context to that? Do you go to private school or a magnet school where the classes are very rigorous and grade inflation is nonexistent? That could possibly help you in admissions. Conversely, if you are a relatively high performer in a bad, underrepresented school district/area that may also work in your favor. Are you an URM? That may also give you a bit of a boost as well. The biggest boost, however, will come from being in-state (are you instate?) and applying early action. If you’re really serious about UMD (and I definitely sense that you are) you must apply early action this November, it’s where they get about 90% of their incoming class.
Can you give any kind of projection about what you’re GPA may be like after your junior year, best case scenario? I’d say it would have to be AT LEAST in the 3.0 range. UMD is getting more and more competitive every year. If that’s not possible, don’t give up! There’s still time to hone other parts of your application, especially your SAT score. I personally don’t think that the PSAT is always a very accurate predictor of SAT scores. I ended up scoring about 300 points higher than my PSAT scores indicated. Take an SAT practice test and see what those scores are.
I don’t think the Class of 2016 is going to be able to take the redesigned SAT, which really sucks, (I would’ve loved to sit an SAT where wrong answers didn’t count against me!) however, look on the bright side, all the prep books for the old SAT will be on sale!! Which is great, because in all seriousness, you’re GPA will be on the low side even with a straight A report for junior year (straight As is what you should be aiming for right now!), so test prep will be crucial.
Also, try out the ACT while you’re at it. Some people just do better on the ACT. Not entirely sure why, they just do. And, the great thing about having your epiphany now is you have a lot of future sittings left at your disposal. I, unfortunately, waited until September to sit my first SAT - do NOT do that.
I want to be honest with you, your chances right now are very, very, very low. You NEED to put in the effort this year and really buckle down and change your stats for the better, and you seem to understand that. Get the grades you need, do some test prep, join a few new clubs, seek the best recommenders you can, and practice your essay writing - but also, know your limits and sort out other options. Transferring may be the best option financially and realistically, and there’s more colleges beyond UMD.
I’m really rooting for you, I wish you the best of luck! Keep us posted - I hope to see some happy news from you on next years results thread. 
I hope this novella of a post gives you some motivation!!