Hello Tree94, welcome to Psych Central,
Ah, you are young yet and so you found your first kiss to be a little scary. It's absolutely fine to have feelings about this and you'll come to experience a good kiss soon enough. So you will move on from this. The joys of being a teenager, enjoy yourself but choose wisely.
If you find your anxiety and sadness continue, please talk to your doctor or a teacher about your feelings.
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein