I have a talent show soon, and I need some songs to sing. Can anyone help?

The talent show is in June this year of course! and I'm really stuck on what to sing. I like pop, rock, and country. I'm a big fan of singers like Taylor Swift, Selena Gomez, The Veronica's, Alexis Jordan, Avril Lavigne, Aly and Aj, Florrie etc... I'm 15 years old and I can sing these songs very good; Suddenly by Ashley Tisdale & Misguided Ghosts by Paramore & 1000 Miles by Vanessa Carlton & Stay by Miley Cyrus. Anyone who can give me any suggestions would be great, thanks! <3