A number of posters (bradl, Queen of Spades, koa, sviato, and countless others) have given you some excellent advice here. I suggest that you try to heed some of it.
At 18, I doubt that you know yourself, let alone the world. My first recommendation would be to get to know yourself, sufficiently well that you feel comfortable in your own skin. In my experience, most people don't get to that stage until they are well into their forties.
If you are comfortable with yourself, you won't care whether you are a millionaire or not, and the degree of wealth, acquired, earned, or inherited by others will not be a source of angst for you.
Re acquiring money, I think you may have it the wrong way around. Such passion as exists in entrepreneurship should be targeted at the product (as in 'I am going to make the best possible version or type of this', or invent something totally new, original and unexpected that people never even knew they lacked), or the consumer, (excellent customer service) than the outcome (the millions happily accruing interest in off shore bank accounts).
Actually, reading your posts, I am very struck by the fact that there is no vision (apart from 'I want to have a lot of money'). Money is a means to an end - it is a medium of exchange (and as such, has been accorded a high value by elements of our society which respect less other values such as vocation, caring, consideration, and indeed, time).
Rather, there is no vision of what you want to invent, leave behind, bequeath. If a business has been established merely to make money, (rather than define itself with an excellent product), neither its owners, staff, nor indeed, indifferent consumers will have the remotest interest in its welfare.
Companies dismiss feelings, relationships (despite the platitudes that 'our staff are our greatest asset' nonsense so many spout in their gushing glossy brochures) at their peril; not only are relationships the key to personal life, relationships and the loyalties they engender are also one of the keys to achieving a certain type of business success.
Just read the passion on some of the threads on this very forum, as members identify (sometimes, with a ludicrous degree of absurd and excessive passion) with the Apple brand - they really care about Apple and what will happen to the brand.
So, my other piece of advice to you at 18 (and I have taught a great many 18 year olds in my life - I used to be a college professor) - is to find out what feeds the passion in your life, what your interests are, and to try to make a living from them. Study them hard, make yourself a master of these areas, and then, if possible, sell your expertise (in the form of a business) to the world.
Treat your customers, your staff, and your brand with respect; far more staff leave good jobs because of rotten bosses than because of poor remuneration.
And, re personal relationships: Well, people differ in their emotional and psychological needs. Some require endless human interaction, and company, while others need greater personal space and crave solitude. However, I know of nobody who can walk the path of life alone, without the support of close friends and some form of family.
