Hi,
I think you are being way too hard on yourself.
I have a hard time making friends, too. It's gotten better as my self-esteem has improved, though. I'm a good friend, and a good person. I suffer from depression, and sometimes I feel like no one likes me. But that's just not true.
You seem like a really nice, genuine person. A good friend. Try to accept yourself for who you are, is the best advice I could ever give.
Maybe those girls were legitimately busy today. Or not in the mood to talk. I'm sure they will come around.
Be good to YOU.