I have a 3.583 GPA as a Sophomore in high school should I stop worrying about my grades?

I got two C+'s my sophomore year at an all boys prep school in New England and I have never gotten C's before. I'm actually really really nervous about this because I've been talking to top academic universities and colleges to play lacrosse at. I know I need to kick @$$ in my junior year and believe me I'm going to make sure I make Headmasters (Deans List) every quarter but please can someone just reassure me that I'm fine so I can stop stressing out over college when I am only a sophomore in high school.....ahhh this is killing me!