Even though I suffer quite horribly from depression I can't be as negative about life as most here.
I think about awful things and experience strong convincing waves that I have no purpose and should be dead..
But for me, I think the purpose of life is experiencing emotion, exploring relationships with others (friendship, family, romantic), contributing to society, and discovering new things every so often be that food, locations, objects, hobbies etc. Maybe we aren't all destined with great life purposes, but achieving what I mentioned above is purpose enough and worth it.
To live it. Simple as that for me. Make the most of what it has to offer. Experiences, lessons through them, people to share in our joy and sadness, relishing in the gifts the World surrounding us is giving, contributing in our daily lives, etc. In the end, not having any regrets about the way Ты lived your life and knowing that those Ты left behind will continue cherishing it for your sake as well. Pretty much, giving it your all. Believing in something and providing inspiration for others to do the same. Do what Ты love. That is your purpose. Your very path. Dedicate your very being into it and do not hold back. Regardless of what outcome awaits you, things still can be fun. As they say, sometimes, it is not the destination that matters but the journey !!!!