How to fake Confidence?

ill keep this short: im severe asthmatic and IMO white trash, both of which cause me immense self esteem issues. Dont have any close friends because of it either.

My biggest fear(?) is my asthma making sex lackluster/unpleasant or causing me to have an attack during, and i cant really rationalize why anyone would stay with me when theres better, unbroken choices out there?

Same idea w being white trash. Im terrified ill say something low class and drive away any friends i make, and im worried the only women who would accept me are trashy women. ive tried changing, tried pretending to be better than i am but it seems like what i am always bleeds through.

i want to feel confident about myself, but i cant because all i really see is someone "less than"

if anybody has advice, itd be appreciated.