You could have a parent own the LLC and then transfer ownership to you when you are of age. Minors cannot enter into a contract like Mac said. You also cannot, according to OSHA, operate powered commercial equipment until you turn 18, and you cannot drive a commercially registered vehicle until you are 21 according to the DOT.
You only get one shot at being a kid, don't rush it.
just mow people's houses kid, then you can tackle the next one when you are older....I don't know you, but you probably aren't equipped with the business experience to deal with those type of commercial accounts yet, good luck