What is the song "Party in the USA" by Miley Cyrus about?

it's talking about when Miley first went to L.A. how when she got there everyone was so famous and she really didn't fit in. she felt nervous and like she didn't fit in. she was missing her hometown (nashville) but every time she heard a song she liked it gave her the confidence to go through with everything. and while her song was on it was like a party in the USA.