I think I am becoming a nihilist.
It seems simple enough, but perhaps it is not so simple.
Life is meaningless.
Do I have that about right?
Please fill me in on what I am missing.
It's normal for mammals ─ you
are a mammal, aren't you? ─ to have genetics with a life plan built in. With H sap sap we have children born, we instinctively teach them our language, we raise them and educate them. They take it all in then they reach puberty and (surrounded by tribal rules and customs) they pair off and breed. We meanwhile continue to age and chat to our grandchildren, teaching them wisdom or whatever.
No one is bound to do this, but it happens all the time and if it didn't we wouldn't be here. A similar statement can be made about each of the other kinds of mammals, though they often leave out the grandparent bit.
As for finding life meaningless, that's often a physical condition related to depression, so the remedy is physical. The first thing to try in order to relieve depression is to walk ─ especially in parks and beauty spots if you have any handy ─ for not less than an hour a day, every day weather permitting. (This is a dang fine idea whether you're depressed or not, by the way, and wonderfully inexpensive.)
And in the evening you can write your novel, run your blog, prepare to stand for public office, even go out to dinner with a romantic interest.
If the daily walk doesn't work after a couple of months, get back to me.