Finding motivation to write is difficult sometimes. People are motivated to do things because of a reward system, whether it's a reward you give yourself or a reward in form of money (at work), acquiring skills etc.
What is a reward you receive as a hobby writer? There isn't much hope of making it big (though it exists!!!) and the long-term joy of having finished your work someday doesn't always cut it .
People really need some quick bursts of appreciation every now and then to keep going. I'm happy to say I have someone who reads my work and gives me proper feedback. Without them I probably wouldn't have written half the amount I did until now, so I'm eternally grateful.
No matter what you do in life and what goals you set for yourself, it's okay to seek validation during the journey from people close to you!! You want them to share your joy and you want them to be proud of you, so make sure they have a reason to be!