You basically have glass bones and paper skin. You are vulnerable to literally all damage types. It is a miracle you have made it this far in life. 

Ability Scores: Your constitution modifier is +5 because you have survived through so many things that should have killed you. 

Feat: Life- you have  higher than average health. Your first level hit dice is 2 d20 + constitution modifier. You gain 2 d20 for each level after that. (yes I know this is not how feats or backgrounds work, this is for fun and so the character with the guts to actually use this background doesn't die from a cr 1/1000 *I also know there is no such thing as a cr 1/1000*

Skill Proficiencies: none.

Tool Proficiencies: none. 

Languages: you know All languages. as a child your parents kept you in your room due to your condition,  so you filled time by learning every language.