I don't want to get married or have kids
Why don't you want to get married or have kids?
I don't want to be tied down and get involved in something that I don't want to do.
Everyone has their own preferences when it comes to relationships and it is perfectly valid to feel like you don't want to get married and have kids. Parenting requires a lot of work and sacrifice and it's understandable that not everyone wants to go through with it.
I don't think it's right that other people keep pressuring me to do it, though.
I'm sure that can be annoying, but you should just tell them that marriage and children aren't for you.