Getting cold feet and tips on how to practice?

I'm not in any productions as of now. But I'm starting to question my ability to act! I've acted for 6 years, I'm 13 years old... I've taken cles before but my instructor charged to much for my parents and since they've both been out of work for a year they had to ask me to stop. They both have work now but the next sign up session doesn't start until the fall. How do I practice on my own until then? I've tried reading scripts, doing a cold read myself- I do terrible! I have to be able to hear the other parts voices in order to do a script read- especially a cold reading. I'm losing confidence in myself because of it... I feel like my talent is steadily declining. But I want to be able to practice my craft and perfect it early on. SO- how do I repel cold feet and practice cold reading and still feel good about myself?