It sounds like you have fallen in love for the first time. Love is a very powerful emotion. From what you describe, it appears as though the girl you care about was interested in being with you also. You seem like a person with a lot of love in your heart, so if this relationship does not work out for you, you will find someone who you can be close with and have strong feelings for. In the meantime, stay busy and active. Make sure you take care of yourself physically by getting enough sleep and enough to eat. It may be helpful for you to write about your feelings or talk to someone who will not necessarily give you advice but will listen to you. Some people even compose poems or write songs. Best of luck.