talk to him, really, the first step to success is to not alienate yourself from the staff and other players. What I said to him when I was on the JV team was: "Hey coach(or mr._____) today(or talking about playing time period) I felt i worked really hard, did a lot of things right, and went 110% to the ball, im wondering why I was taken off so soon, because I would really like to get better and get more time, and the first step is to know from you, what I need to really work on after practice and on weekend"
You tell him that, and I guarantee you three things: 1). The coach will love you/respect you above any other JV players 2). because you have shown him you have drive, and determination, your name will almost immediately be put on a list of potential Varsity players for next season, or even this season 3). they will start overlooking tiny mistakes and faults because they know/think you will work 110% to fix it.
Also, if you are a bit out of shape, ask the HEAD coach for a ball after practice, so you can do some running with the ball, or ask for a few to work on shots, that also puts you in really good light.
btw, good news everyone, im sure you care, but next season im likely going to play NCAA DivII soccer with ESU, im going to have to pay, but last years seniors,who play their now have told me they are sure I will be able to make the team, since they don't have many players who are really good on the ball. I will have to lose more weight, and get really fit for the Uni level though. Even I don't make it, ill play intramural, and then try out the season after, if a player comes out for the team a couple of seasons in a row, they are bound to take him.
just kidding 
) and i've just got to wait.
