Schengen Visa Application - About Bank Statement..

Hello  :)

I am planning to visit my boyfriend country for 10 days. 

For the Finnish Schengen visa application they want my 3 months bank statement. The problem is that I am not paid that much and I don't keep my money in my account . They will see that I don't earn that much and also that my account is sometimes empty   

Do you think they can reject my application because of that ?  :|

Do you think my boyfriend who will write the invitation letter should also say that he will support me financially during my stay ? 

Thank you very much :D

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