Friendship worries.Help me..?

So I went on a holiday to Australia for 5 days and I'm going to school on Monday. But I'm worried that when I go back to school that everyone will hate me or ditch me for better people especially this new girl called Julie whom I really like ( not lesbian) I'm afraid that Julie will find some of my friends better than me and I end up being a loner since I'm sort of shy and quiet.