Hi, well you might not like my advice, but here's my thoughts about the meaning of life......by the way, I'm 43 years old and have done plenty of thinking on the subject so just take this advice as from someone with some life experience.....No one really knows what the meaning of life is, but it is possible to find meaning to our lives. It seems like it is all for nothing (everything we do in life) but the things we do can make an impact. To me the meaning of life is learning how to overcome obstacles that keep us from feeling or being whole. And, caring for others---being loving, giving, kind, unselfish, and humble, can make life meaningful. Also, it helps to have Faith, because with faith one can see that it all doesn't end when we die. I know there are many people who do not believe in God or eternal life because it is hard to believe in something that can't be seen. But I have proof of something greater when I think of the whole universe an it's creation---it could not have evolved from nothing. I think of the planets, the sun, moon, everything in nature, the beauty of it all. But that's just my opinion.
I don't know the answer to stop thinking about what the meaning of life is, I'm sure everyone has thought it before, the secret is to change your thoughts on it. Find meaning in your life, whatever that may be, as long as it is for the greater good. And don't feel as though it is all for nothing because our lives matter, for whatever reason there can be purpose to life.
Take care :)