The way I see it; if the system doesn't respect you then you need not respect it. That being said, there are ways to do business as an individual fully legally even under the age of 18 in most countries (No government spares a child's income from taxation). My suggestion is to incorporate, or register another business entity like a proprietorship and use that for all transactions pertaining to the business.
Branding your business/services offered is a different issue & up to you how you choose to promote it.
Personally I have registered professorships or partnerships for each business I am involved in, even though a lot of my customers know me personally.