Impulsively tell different friends different things?
So, I have two different friends I'm having this problem with. They're both pretty different from each other, and I love them both (in a friendly way). But, sometimes, I tell both of them different things about myself. Like, I'll tell one that I think that singer is ok, but I'll tell the other friend that I like her! Then, they both get really confused and get mad at me and ask me to explain (it's usually about something more serious than that, though.) I'm not doing it on purpose, it's just that my opinion seems to change depending on which friend I'm talking to.
So this time, I told one of my friends that I wanted to see this movie. I few weeks later, she invited me to see it with her. I said yes. But, I was a little unsure. Also, we had just had a mini fight, so I thought it would be awkward to go to the movies with her. So, I called my other friend and told her i didn't really want to go. I told her I was going to tell my other friend that I no longer wanted to go, and she told me she wanted to hang out with me that day instead anyway. But, when I was on the phone with her, we worked out our issues, and I didn't say anything about the movie, I just told her to call me about it tomarrow. Then, apperently Friend 1 (the one who wanted the movie) called Friend 2 (one who wanted me to hang out with her) and Friend 2 got mad because I had told them completely different stories. Now they're both confused and mad at me. Is it normal, and what should I do?