My Parents Never Trust Me, What Should I Do?

i mean they still look at me as a kid, im 20 and still living with my parents, and i have no idea to move out cuz im happy and my parents are happy too, i have just one problem with them and it lowers my self esteem every time they do or behave in that way, they still look at me as a kid and hesitate to handover any responsibility to me, they don't even believe me for paying the bills, they think ill get robbed by muggers, things like these. Which makes me feel bad and like i guess im not strong enough. And in fact it affects my self esteem and self confidence greatly. I feel like no body trust or i can't be trusted ever in my life cuz their this kinda behavior gets stronger towards me with time. They think i can't do anything thats my bros and sisters been doing cuz im not strong enough. i have no idea to move out so please don't give that advice. and talking about it to them will make me look immature, so please don't advise that too