Stock market trading likes a roller coaster

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I have been stock market trading with forex (cable), I've started study with someone who knows and experience in this subject. I've payed a lot of money. cause i want to try and learn it and make it become my another job. Then I invest my money in stock market trading, I use a mini account. But.. the prices is unpredictable..its like a roller coaster, wow.. so I lost my money so quickly, a lot of money i think. Maybe I'm not experience and my emotion push me to take position. so what must I do?