If i go to OCS to become a Marine Officer and i fail to become one,can i still enlist as a U.S Marine?

Okay im a Jr in Hs and ive been wanting to become a Soilder since i was kid, and a U.S Marine since i was in 8th grade, My mother and fathers side has a long history of being in the Army/Navy, but many of them have ped, I want to Be the first to Join the U.S marines, but not only do iwant to be a U.S marine I want to lead Marine i want more I want to Become a U.S Marine Officer, im thinking about going to Military College with a NROTC, since its a requirment to look at colleges for a certain cl im taking, but I am Just curious If i fail To become a U.S Marine Officer during the P.T or just in general, Can i Still enlist to Become a U.S Marine ? or is it one or the other?? Please this is a really confusing question for me If anybody has any Knowledge on this please leave your comments It will help me so much. Thank you for taking your time in reading this.