Feeling left out and misunderstood as an introvert

I’m 21F and an introvert, and I often feel misunderstood by my friends. Sometimes I feel treated differently or left out, and it affects my confidence. On top of that, I’m struggling in my love life. I care deeply, but don’t know how to express myself or handle certain situations.
I’d really appreciate advice on how to navigate friendships, build confidence as an introvert, and handle love and relationships when you’re naturally quiet or reserved. Any personal experiences or tips would mean a lot.