Hi and welcome!
You are not alone in how you are feeling plus we have several members currently posting about issues with siblings so you are not alone.
Can you share more details with us? It will give us a better idea of how we can support you and possibly help you with re-building your confidence. Other than here, what sort of support network do you have? Some of us have people we can lean on and others of us don't. Regardless, we here can help you.
I hope you share more when you are ready. In the meantime, check out the links tacked to the top of the page.
Again,
