Hello. I see that not getting into a college of your choice has been disappointing. Sometimes we are unnerved when things don't go our way. Have you considered expressing your worries to your parents and girlfriend? Perhaps they may be able to understand, empathise, support and guide you.
Are there other colleges/ courses that you are interested in , starting to work toward exploring these actively may help reduce the worry.
Next Steps
If the worry persists and you feel like there is a lack of support from near & dear ones, do consult a counselling psychologist who may help relieve this worry.