I really want to become an actress!Do you think I can do it?

I LOVE acting soooo much! Its my passion... I cant go a day without thinking about it. I go to a school for the arts and im in drama, so i will be studying i for all of highschool!!:) ..I have been in a few plays in and out of school(about five) and have an agent,so I have taken acting classes before. The problem i my agent never gives me any work or sends me out to auditions..i only go for backround jobs:(...but at least i know what its actually like...andstill LOVE the idea of it. however, I know enough about it to realise how hard it is to get anywhere...I want it soo baddlly and I want to continue studying it in university(even though im 15)...But im afraid wont make it. Is thier anything else i could do to get more experience? Do you think that I should continue with my unrealistic dream?