School motivation

this year marks my last year in high school, i am officially a senior and i am beyond terrified. this is the second semester of the year, the last one i might add. im behind in credits, i don't know if im going to graduate on time. i don't want to fail, i want to go to a four year university, i've already applied to schools and everything. i don't know if ill be able to finish though. its partly (mostly) my fault. ever since i've gotten into a relationship i spend all of my time with them, even as i write this we are just on ft. i also procrastinate. i think i've figured out why, because im scared to fail. it makes no sense but if i don't do the work then i know i will, but what if i do and still don't make it. thats terrifying. i don't know what to do. how do i get over this, how can i get motivated, how do i stop procrastinating