I’m applying to college this fall as a senior in high school and my GPA (unweighted) is 3.85. SAT I and IIs still have to be taken, but I have lots of practice for those. I’m specifically worried about my extra curriculars. I haven’t done any that lasted longer than 3 months & I just got really caught up in academics that volunteering was erased from my mind. 
Any way on how I can save myself?
90+% of colleges don’t care about ECs. And in all cases academics are more important. Unless you’re trying to get into the most competitive schools I wouldn’t worry about it. Pick something you like and stick with it, or get a job.
Thank you!