SUBREDDIT: r/dating_advice
TITLE: [21M]I went for the slam dunk. I walked away feeling awkward, ashamed, and miserable.
POST: 2 of my very good friends are going away for college in a few days so we threw a last minute get together and a going away party. At this party we invited the girl i have been crushing on and flirting with for months.

Me and her share the same sleep schedule. (Sleep during the day and are awake during the night) We end up talking quite a bit .and we have a lot of the same interests. We also flirt physically and with words. Hugs, arms around shoulders and stuff like that.

Well about 2 hours into the party my friends give me the courage to take her aside and tell her how I feel. So I summon all the courage I can muster and just do it. She flirts laughs about it and we talk for a few seconds. She then gets up. I put my arm around her waist and pull her to me. I say i meant what i said i wasn't joking. She laughs and says "I know." I then kiss her. 

We do what you could call making out i guess for about 10-15 seconds. She doesnt seem to care then she slowly stops and i get the vibe i had done something wrong. I pull back ask her if i should stop she just shakes her head gets up and leaves. When i say leaves she walks into the next room where everyone is laughs and waves goodbye giving everyone hugs. I catch her alone before she leaves and tell her i am sorry if i made a mistake. She looks at me smiles a kind of sullen smile and says don't worry about it man. That is the last time I saw her.

Now I feel like an idiot, I feel like I fucked up and I feel like no one I know cares or understands what is going on.
TL;DR: 
I pour my feeling out to a girl, we kiss for a second, she then stops me and leaves me feeling like an idiot. AM i screwed royally or do I have any chances of rebuilding this relationship.