Already enrolled, can I let myself go?

I (17m) was just admitted to my dream school and I’ve already put down the enrollment deposit. It’s to the point where I’ve even gotten my college id and created a college email. I’m also an NHS student and I’m a part of a couple different clubs. My question today is that where I am today and being this far along the enrollment process, can I give up NHS and everything else and coast out the rest of my senior year till graduation? I don’t know, I have a lot on my mind, but I really wanted to ask this and get a second opinion.