Helium.com don't explain their payment policy properly.

I'm 13 years old, recently i wanted to earn some money and be independant. I tried many ways to earn money safely at my age. I then stumbled upon Helium.com they claimed you would earn money from articles that you wrote. I registered to the website and read the how to earn money on helium section of the website. I thought i understood what they were saying and it seemed like you got payed for each article depending on your writing stars. I started writing articles non stop for about 3 days, I managed to write around 15, 12 word poems and another 13 400 word Articles. I made sure i didnt plagarise and worked very hard. I noticed that the payments i thought i'd recieve wasnt showing on the earnings and payments page. I emailed the help centre and asked why it wasnt showing. They then told me about their 'upfront payments' They made a theory that the first 5 articles written on a certain title where the only ones paid, Apparently articles recieved more revenue. I thought this wasnt fair because people will then rush the articles and then the articles will be poorer quality. They also mentioned that creative writing articles were not paid. Furthermore, If you arent happy with the company and want to delete the articles you then cant. I think that the company knew people would want to withdraw their articles once they realised that the payments were not worth the work, By making it impossible to delete the articles that the writers wrote they are still going to earn revenue from them but the writers will get paid about a pence/cent while they get paid more. I'm not sure why creative writing articles (ie. poems) should not get paid, its obvious the company know that poems are easier to write, so people can make more poems which could earn them revenue, more poems means them having to pay the writers more. Moreover, I realised that some of my articles were one of the first five to be written on a title and they were not credited! I tried emailing the company but they just said i should read the Help section.