What do i have to do to be able ato fly planes in the air force and or any other branch?

i am a 17 year old high school student i have flew a air plane before but never solo. i dont make that good of grades my gpa is around a 2.5 and im about to be in 11th grade. i have always wanted to fly planes and i want to know what i can do now so that when im older i can become and officer and fly planes. any ideas besides working on better grades?