So you went to an amateur gun range at summer camp and shot well over 100 feet. Any 7th grader can. I shot a squirrel right through the eye as it ran across the target beam with a bolt action .22. Completely by accident, but it happened. I won't brag on having skills as that was a one in a million shot. I could never repeat it.
Getting such a low accuracy with a machete to a watermelon....how can you miss it once?
Hand to hand combat? Took a semester of karate and now you're a ninja?
Point is you're 14 and already under the delusions of grandeur. I agree with your mom on restricting the violence you participate in. I would want to restrict violence content if my kid was bragging such crap. That shows that even if you had said skills, you are far from mature enough to use them in any applicable situation.