Can't help but to feel super jealous..

I hear about my friends getting engaged, attending their weddings, and even acquaintances talking about their fiancés and I get super jealous. My boyfriend and I have been together for a while, through think and thin, but still no ring. I understand I shouldn't rush anything and I understand i shouldn't want to be engaged for the sake of being engaged. I love him to death and I would love to get engaged to him. We talk about it often but these talks only make me want it more! I can't shake this feeling of jealousy. How can I stop this?!