<human>: Condense the text into a few key points

First, I should start off saying that I love my boyfriend more than anything. He's my best friend and has been since we were kids. He's intelligent, attractive, and an overall wonderful human being. But I'm not happy. It's not because I don't love him, but it's because I feel like he always chooses something that's not me. I don't want to spend my life as a fall back option. I won't leave him, so that's not what this is about, and I'll just disregard anything that implies I should. I just know I cant be the only one who has been in this situation. I tell him how I feel, and he always feels bad and says that the next time around he'll show me that I'm important by choosing me, but in reality, he never does. It's caused me to have serious anxiety problems, and confidence issues. Sometimes it feels like I'm even losing myself as a person because I'm trying to morph into someone that he'll choose first, and it's made me really angry. I'm desperate, and I'm done feeling like this. I dont understand how someone can tell you that you're their world, but then put so much, and so many above you. What are some tips for communicating how I feel to him calmly? I feel so angry at him all of the time because he never chooses me. I want to stop being so angry, I want to be happy again.
<bot>: I'm not happy because my boyfriend has constantly chose other women and experiences over me, and it's causing serious issues. How do I stop  being so angry about it?