My advice as someone who has taught on a few courses: shave your head. You only get one chance to make a first impression. A shaved head gives the impression that you understand you have to go by someone else s rules now, you have a positive and eager attitude towards being successful in your course, and you are willing to be part of the team.Imagine showing up on day one with an earing, long hair and an attitude, How do you think that is going to go over in the long run?
You will soon find that in a military unit, everyone has there part to play. Some people can run for a week without stopping, some are very intelligent and know just about everything, some are very funny and keep morale high, some are built like brick ##$houses and can do the physical labour of a small forklift, and some blossom later on in their careers, but the fact remains that they are the sum of all these parts.You will be a part of this.
Now transfer this mentality to the larger part, and you begin to understand how tanks can't run unless they are fixed by mechanics, mechanics won't work if they can't eat, cooks won't work if they don't get paid, tanks don't get anywhere unless there are roads and bridges that are safe to traverse, and nobody can get over land or water without a ship or a plane.
Bottom line, suck it up, we all have our issues that we are subconscious about, but we also all have our strengths, which help the team out and are a necessary part of the whole entity.
Good luck and get a haircut! Skinned! Now!