Why is sharing writing so hard?

I relate to this so much, I didn't share any of my work for years until I decided to say fuck it and start publishing! I think the reason it feels so weird and cringe is because it's so vulnerable. Regardless of what you're writing, it's all you (I write poetry, so this is especially true for me lol it's like I'm sharing my soul and it's very uncomfortable). 

All I can say to get past it is to just do it. Consciously force yourself out of your comfort zone at whatever pace you can or want. Consistently pushing yourself in little ways to put yourself and your work out there, however nervous or intimidated you may feel.