I’m not happy whatever I do

Before realizing nihilism I had a reason to live, strived for it, and struggled with myself. However after getting nihilism as time goes by and aging, I don’t really have an enthusiastic will to expand this boring life span. What’s more surprising is that Im not even an adult. might live less than in my early 20s. I even have another friend suffering from the same problem but seems like a chronic symptom that will have never been treated. he has been in this problem for around a year but it still proceeds. Nihilism is a mortality..