We all have different values. Being a family member is not on my list.
This may sound strange to a lot of people as "family" is the most important thing in very many people's lives.
FWIW 30 years ago I chose to leave my (conventional and loving) family behind to hit the road (started hitch-hiking which later turned into bike riding), and I feel my life has been rich and rewarding, full of love and friendship in relationships other than "family".
I have no bitterness or hard feelings towards my "old family", and my choice not to "start a family" is not caused by bad experiences (just in case someone felt like diagnosing me

So maybe my next dumb bike ride is the most important thing in my life, and I am confident that those who love me would wish for nothing else than that I follow my dreams and adventures...

The advice from others about planning may work for you, but you don't have to plan anything! A bike, a minimum of camping equipment and some money and you can just take off on your bike, the rest you will learn or work out on the way. You don't even have to know which way you're going! Get to a fork in the road, you go left or right... follow your heart...

I have a suspicion that a lot of older people become reliant on planning for a sense of security, when maybe, when they were "18", they just left home and hit the road...