Sometimes people are just more guarded, as well. Growing up as a young adult (then) my friends would tell me they didn't like me when they first met me. It took time for "me" to grow on "them". They thought I was a bit snobbish and unfriendly.

As time went on, I was able to lower my guard with those I felt safe or comfortable with. I wasn't a snob. I suffered from social anxiety. I wasn't unfriendly, I was scared. Once my guard was down, they were able to see my playful side. I had a pretty good sense of humour, afterall.. and once they learned about my anxiety, they accepted it.