Am I crazy? Ex having kids...

My ex just had a baby today and it is really upsetting me. My boyfriend (we've been together for 4 years) doesn't really understand why it upsets me so much and he thinks I need to stop. 
Am I crazy? Is it normal to be sad when your ex is having children and you're still in school, not engaged or married, and still years off from having a family? :/

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