Story of my life my bruddah. I'm a rising senior myself. Let me tell you my story real quick for some motivation:
Freshman year: I was very apathetic about school in general; didn't know what I wanted to be; casually thought about going into computer science. Avg GPA: 3.2
Sophomore year: Same attitude as Freshman year for the first semester but a little worse as I got more distracted by friends and such. B's in all my classes with a C in chemistry. I received a D+ on my chem midterm and holy crap I was shocked into high gear. Second semester I was a completely new person. I came to school dressed everyday in slacks and button-down shirt, lived in the library and achieved 95+ in all my classes (minus French lol). Character changed completely and I had casual ideas about the health-field. Unfortunately, because of my stellar grades, I sort of turned into an arrogant-dingus and some teachers began to notice. I have fixed this problem since then. Avg GPA First Sem: 3.0 : Second Semester: 3.9
Junior year: A continuation of the end of my sophomore year; but not quite as good. I averaged Low A's. Second semester I averaged mostly A's and began to slip into the B+ range for a few classes. Unfortunately I began to slowly burn out. I found myself working twice as hard for a B+ when last year I would have had an A in half the time studying. I managed to finish the year with a 3.75 gpa avg.
Senior year: It's time to change tactics. My school is very competitive (everyone is a "good student" since it's a private school) so it's easy to burn out as I learned. I need to develop a social-life because I'm beginning to lose motivation which results in burn-out. My writing skills are going to trash too and I have no idea why. If I don't get this under control, college will be a disaster.
So in conclusion, you have time and room for error. Just kick some butt next year and it'll be good. However, don't sacrifice your social-life as I did. Learn to sprinkle enough of it in to keep you sane while keeping the highest gpa you can.
Best of luck my friend!