I can't decide if I'm a introvert or extrovert?

I prefer to be alone and 85 percent of the time I am. I'm usually in my own thoughts thinking about the universe and humanity. This is the image one would get when they think about introvert but there is a catch for me; whenever I am in a social setting such as a party I am the life of the party usually the one who talks to everybody about everything. I love to make speeches and whenever I have to present anything I am the first one to volunteer simply because I Enjoy it. I hate nightclubs (extroverted setting) and would much rather prefer a museum or a walk by the ocean with or without anyone. So what does all this make me? A extrovert or a introvert?