I am 26F, I don't want to get married ever, I have a plan to adopt a baby girl in future... How to convince your parents about it ?

I am earning decent amount now, will make it way better in 2 years.. that's when I am planning to adopt the baby girl.. Edit - I tried convincing my parents twice, they aren't happy with it. But they are not the type who would force me to get married too. Edit 2 - I have an elder brother and I don't mean leaving my parents, I want them to support me and not taunt me or pressurise for marriage in future. Either way, I will always be for them, take care of them in all ways.. if they are okay, I would love to live with them too. Edit 3 - The reason is I haven't been treated well by men , male friends, ex Bf and some male relatives too. I don't have that trust on anyone, nor have energy to invest my feelings again only to get disrespected in future.. I know all men are not same, but I give up.. I can find my own happiness in my way ..