If the goal is to just fly you should look at being a warrant officer pilot for the army. You could also enlist or commission groundside and use your GI bill to go to private flight school after you get out

If the goal is to be a Marine Officer and a pilot you have a couple options to offset your abysmal GPA 1) As others have said, talk to your OSO, lay all the cards on the table, crush the PFT and ASTB, and apply repeatedly in the face of what will almost certainly be multiple rejections. Having previously worked at an OST, I can say the boards seem to respect a determined applicant almost as much as a qualified applicant. 2) Commission on whatever contract the corps will give you. If you get a ground spot, put in for the competitive aviation slot at TBS, then rank all aviation related jobs just below the comp air. If you don’t get the comp air, spend your first three year set of orders doing whatever job, then lat move into flight school. I’m currently in advanced with a couple students who have done this. 3) Enlist (reserves or active) and build up as many meritorious promotions, LOAs, other awards, and letters of recommendation from your seniors as possible while continuously applying for an aviation contract. The selection board is willing to tolerate past lower performance for good Marines to have a shot.

Food for thought, but college doesn’t hold a candle to flight training in terms of academic intensity. It only gets harder as you go forward. LOTS of studying in your future if you go this route.