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----------PART 2||Answering your question--------------
As far as how to go about living a meaningful life, it's important not to forget what exactly it is that we are, as human beings. We're animals... we have basic drives, instincts, we have rather complex social interactions driven by these, along with desires, hopes, and dreams driven by them as well. No matter how much we consciously believe these things to be of little to no value, to not matter, or have no meaning, we cannot escape that these things all arise as consequence of our functioning a living and conscious, aware, intelligent/sapient beings. Literally the structure of our nervous system has been molded and developed through the course of time and our evolution such that it causes these things.
Look at structure of our societies and how they were run during the course of our history as a species. No matter how archaic or backwards a lot of it may seem, the fact that that's how life was for so long for us as animals and the fact that it worked in terms of our survival, how ingrained it all is in our unconscious is undeniable.
To live a life of meaning, you have to embrace the fact that there is suffering inherent in existence as a living being and accept that without resentment or bitterness, and you need to take on more responsibility in your life. Mature and become an adult in all the cliche and again, sometimes rather archaic seeming ways you've always been told to in life. Take care of yourself and your affairs and become good enough at it that it could even be feasible for you to actually take on taking care of somebody else and there affairs, whether or not you have kids. Be a good person who at least always tries to tell the truth and who avoids to the best of their ability to add any additional suffering to the suffering already present in the world and help others out. Learn to trust people even though most of them likely don't deserve it and might hurt you as a result of it.
In the end, you don't actually need to matter at all to feel like your life has meaning or to like yourself as a person. Mattering winds up coming as a matter of course if you do all of those things I said and is just the icing on the cake. You aren't owed being valued by others, you need to earn and should want to earn that by your actions and interactions with them. The people that you will matter to (and vice versa, for that matter) will come and go, and you will probably wind up all the way back at square 1 again with no one or nothing that you matter to, but you've already been there and conduct yourself in such a way in how you go through life that, as long as you open yourself up to others and try again, you will matter to others once again. Honestly, knowing the kind of person you are, even in spite of how bad you could be and other people are, is enough to feel a sense of fullfilment and meaning in your life.