Life doesn't have external meaning. But that doesn't make it meaningless. We still have feelings and preferences. Some are short-term, some are long-term. The internal meaning of life is encoded in these preferences.

The preferences aren't stable, because we and others have influence on the meaning of life. You get some choice! Others can affect the meaning of your life. Hopefully for the better.

To say life is meaningless is wrong to me. Because we experience these profound moments of meaning on occasion. Either positive or negative. So to me, these moments of meaning are my guide. This means deep friendships, being there for people, contributing to society, trying to become a better / stronger person, and just trying to enjoy myself most of the time.