No matter how much other people don’t believe it, you are perfectly capable of being a selfish, whining, and insecure twit.
Sometimes people have more important things going on in their lives and can’t just instantly attend to you when you want. This doesn’t mean you aren’t important.
Your insecurities are largely in your own mind, and rarely borne out in reality.
When you know you’re being insecure and impatient, listen to yourself and stop fretting over it.
Repeat as necessary.