Welcome to Psych Central Reina. And thanks for sharing your social anxiety related concerns here on PC.

I'm an old man now & almost completely reclusive. But what you wrote about yourself would all, pretty-much, have applied to me for much of my life. (I was an only child though.) Having written that, however, I don't know as I have much of anything in the way of suggestions to offer you. But here are links to 6 articles, from Psych Central's archives, that offer suggestions for coping with social anxiety:

Social Anxiety Overview | Psych Central

6 Ways to Overcome Social Anxiety

7 Ways to Overcome Shyness and Social Anxiety

Treating Social Anxiety Disorder with Mindfulness

Overcoming Social Anxiety the Alchemist's Way | NLP Discoveries

https://psychcentral.com/blog/podcas...-controls-you/

I hope you're finding being here on PC to be of benefit.