I tell my friends and family I don't want a wife and kids because that would be a prison sentence but that's not why at all.
Why would marriage and kids be a prison sentence for you?
No one who gets married and has kids will be truly happy
Your opinion may be outdated and you can still believe that and you are allowed to not want a traditional family. It is not for everyone, however, an unhealthy marriage with unhappy children is not the outcome normally with marriage.
They are unhappy because their parents are not willing to deal with raising their kids and the way the parents treat each other.
You must have had a difficult childhood, but it's not okay to assume that all marriages are bad based upon your experience alone. Lots of families are very happy and you can be too if you find the right person and work hard at your marriage.