<human>: Can you give me the gist of the text in a nutshell?

Most people see me as being very one of the most outgoing/open/social kids in the school, but at times that is not really the case. I am very social with my group of friends [obviously], and I am very talkative and easygoing in class [where my reputation comes from]. I can also be very social if I am warmed up and comfortable in a certain situation. When I am feeling social and confident, I am very funny and I am usually the life of the conversation. 

However, I can be very awkward at times. I have trouble jumping into a conversation with people I do not know very well. This is one of my biggest barriers to gaining new friends. If any of my jokes fall flat, I immediately feel sad and dejected. The same goes if I do not become the life of the conversation. I'll feel inadequate and drop out of the conversation. Sometimes I'll do the opposite and become even louder to the point where people think I am weird and/or annoying [this happens probably a little bit more than the first one]. I'll do that in order to cover up my insecurity, but I'll still feel inadequate on the inside. I feel the need to be funny/dominate the conversation all of the time. I am very streaky with my confidence/humor, so one bad social interaction or joke can ruin my day in terms of confidence.
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One of my biggest problems is with girls. I don't have deep friendships with any girls, although most find me to be funny. I can be kind of nervous/awkward with girls, and confidence is even shakier around them. I am also infatuated with this one certain girl, and I can barely speak to her. She thinks I am hilarious, and I initially got along very well with her. She is also very attractive. But I eventually became infatuated with her for no reason, and now I get nervous when I'm anywhere near her. This is the third time this has happened to me with a girl, and I think it stems from a lack of confidence.

I am sorry for the long post, but I really need help.
<bot>: I am awkward with people I don't know too well and girls. I feel dejected if I every joke does not make everyone laugh.