Does being undecided mean i won't make it in the Marines?

I've been wanting to join the Army since 7th grade (I'm in 10th grade now) but I've been looking at a lot of stuff from the Marines and seeing how Marines "speak" online and such. In other words, I'm really undecided. I haven't looked into the Marines nearly as much as the Army but It's enough to make me question where i belong. I don't know too much about their MOS policy (though i heard it's not guaranteed), payment plans, hell i don't even know much about their training and that's one of the reasons i want to join! If you'd like to know my main 2 reasons (although the first may seem like stupid teenage "omg i wanna be cool" stuff: Pride. Every Marine or anything to do with the Corps is filled with this pride and even lingo that carries so much weight. On this website, somebody posted an excerpt from a book called "Who were you with" (i believe) in which a Marine was walking with his wife and saw various Marines whom would've remained undetectable to anyone else were it not for their Headwear. There's more to the pride thing but i digress. The training: I've looked into it SOMEWHAT and of course I''ve heard that Marine BCT is harder then any other branch. One of my reasons for wanting to join the Army was to ACCOMPLISH something to be proud of and i figured i want to be the best i can be. There's more to that too but now that you have my incredibly long backstory here's the main question: I know I'm only 15, but does me being confused right now mean that I'm not meant to be a Marine?