Why does my family make me feel that I have to prove my worth to them?

My brother and his girlfriend always make plans and go on trips with his gfs brother and I’ve never been invited.
I just don’t understand why people make me feel that I have to prove my worth. What am I doing wrong my other friends or new people that I meet love my company and they compliment my looks constantly

Why does my family make me feel that I have to prove my worth to them?
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