"We ARE here so that's it" doesn't explain the meaning of life. We can't do whatever we want because we abide by human morals. You wouldn't rape your best friends sister... why? Because it's morally degrading. So if we are born, crawl our way through life and then die, you'd raise a question about our moral conduct and why it's not in our blood to act the same as animals do.
I asked the same question about the meaning of life a few years back. So I came to find myself in a relationship with Christ, and to love Him with all my heart, soul and strength. You first need to acknowledge the existence of the supreme deity to go down this road though. I acknowledged, because the practices we do within the Christian faith works. Other people would try a different path to acknowledgement. What I'm saying is, if you want to know the meaning of life, your best bet is to find out how we came to existence. Like returning a car to its manufacturer to get it serviced. We have lost motives and need to get our foundation right.
Ultimato
We are here not to just give questions, but answer them. We are here to be here. We ARE here so that's it. We can do whatever we want because we are here.