I lost a student council election. How do i deal with loosing?

I finally got the courage to run for student council treasurer at my middle school. I worked really hard on a good speech and great, creative posters. I put so much time and effort into this. Then, the person who I thought was going to run but said he wasn't decided to run and he has younger brothers and sisters. He ended up winning. I got my hopes up because I was going to be unopposed but then he jumped in. Plus, 3 of my best friends ran for other positions and won. I feel really sad now because I feel like they are going to become super close and I'll just be a third wheel. What can I do to feel better?