Why am I lonely?

Melville, take or deny my information I will say as you please, but to any common man on this earth, it seems that you have everything one could ever want. I mean, you listed everything anyone could ever define as the cure for loneliness. This is what you have; a Healthy body, Healthy mind, Healthy sleep habits, healthy diet, and great friends and family that are alive, you are optimistic, yet you are desperate and running out of answers for your life. Something in your life is missing, and something in your life is lacking. Fulfillment is not there, and there is a constant anxiousness in your every step not knowing what will happen next.
As of this post you are 4 days clean from PMO, so this could be a lower part of your life, but other than that you have felt this before regardless of your circumstances.
I naturally have to answer according to what I believe to be true, and right now, you are at a point in your life where you lack something that you can not find, or yet you deny. Melville, you simply are struggling with the meaning and purpose of life, simply put.
You're not lonely, you're lost, and that's why you're desolate. You come to your senses and realize there is a greater something other than what you have now. The "one puzzle piece" is missing, and it finally bothers you that you kinda want that piece to fulfill your life. This may not be answering your question, but rather just help you out in getting your thoughts more on paper so you can think on it. DM's are open if you want to talk more.

 

I think you should read a biography of Descartes or other philosophers. You're going through some seeking times right now, and maybe just in general get into a little bit of philosophy and struggle and fight through the tough questions in life. You wrestle with the very confines of reality and dive deep into the battle of the mind, body, and soul. You will circle back around if you don't choose a new path that isn't in the direction you've already been in. Some other pro tips; get rid of all social media, and limit your internet usage on your phone (it's possible, but difficult for the first month) You must be able to define your terms to better grasp what you are dealing with as well. What do you fully mean by " social media" " loneliness" "meaning" and "purpose", this will help add some clarity. Definition seeking is a very good thing to get into regardless of what others say.