Inadequacy inferiority insecurity
Jealousy is an involuntary emotion
Its triggered when you feel like you are lacking something and someone else has it, so you want it for yourself
When you feel secure and confident, when you love yourself, you will rarely feel jealous because you are content with what you have .
Jealousy can also invoke a healthy motivation for you to set goals
If your sister gets married,
you can be over the moon happy for her but also be jealous at the same time
Because maybe you want to be married and its not happening for you
That jealousy can motivate you
And there is also Envy, which is jealousys evil cousin
Envy is not the same as jealousy
Envy stems from being hateful,
when you are envious you feel entitled
You see something that someone else has and you get angry because you believe they dont deserve it and it should be yours
And because Envy is hateful, people can rarely contain it and it spills out in the form of bullying, violence , stealing etc
Whereas jealousy is usually more innocent