re: Thinking about joining the military soon and...

A 51 is a pretty normal score. A 36 is the minimum to enlist in the USAF BUT A 50 is required for Coast Guard. Like others have said it depends on the job you want to do. In USAF you need a G64 for Cyber Security or Cyber Ops but for Supply (Material Management) you just need a G44. Remember you only need to meet the minimum for the ASVAB sub area (mechanical, electrical, general, administrative) like G for general above.

So the big question is... What do you want to do? What skill do you want the military to teach you for free that you could use later in the civilian world? I learned computers and electronic in the Air Force and it set me up for life.