Why as people do we let others make us doubt ourselves?

It’s low self worth people have! Nobody should ever have control over how you feel but SELF! When most adults don’t get actual acknowledgment as a child real protective love as a child etc it manifests into adulthood millions of adults are still dealing with childhoods trauma! Thats why many allow opinions of others affect them

@Amanda84

I think it's human to listen and consider other people's opinions, partly for survival purposes in a primitive sense...

However, this doesn't make unwanted opinions okay, especially if they hurt your feelings in turn. For example, my family always comments on my partner's appearance when they are not around, and although I always defend their name, it doesn't necessarily stop either.

I think in these moments it's important to prioritize your own happiness and block everything else out as noise. 

@Amanda84  I know the saying “Stick and Stones may break my bones but words will never hurt me” I have found that a lie in several occasions. Words can hurt deeply and for me it depends on who is saying it. I have recently been through this with someone I love deeply and it has crushed me.  As far as what do I do. I let them know it was very hurtful but I do a lot of self talk