Can i make ROTC or is it out of my limits?

I suggest you take a look at the official website and check their requirements. Work out and gain the ability to do many pushups (again check the requirements) but also aim higher than what is expected. Endurance is also important in running. You seem like a mentally prepared person so i wish you good luck. It is not out of your limits, everyone has a chance just work hard for what you want and you'll succeed