Once you recognize that nothing outside of your mind can bring you one scintilla of happiness, peace and contentment, you won't seek it in people, things, activities, experiences, etc.
This goes to the problem of the lack of education of our minds, and one of the results of that lacking is that most people perpetually seek what they most need (which is peace and happiness) in external things, including other people. But what people find time and time again is that their needs are not met when they get what they thought would bring them their peace and happiness.
And so people keep looking, or they change the people, or the things, or their job, or their home, or their town, or their car, or their interior decoration, etc etc....all to no avail. And so this goes on and on throughout most people's lives.
The first thing I would recommend is not to label yourself in any way (calling yourself a loner). Labels are very damaging (two you and to others) and they are never true anyway. We are all alone in fact, all the time. Even though sometimes we have people around us, does not mean we are not alone. Other people just give us a feeling that we aren't alone, when we really are.
Again, this goes back to the problem of a lack of education for our minds, which if we had, we would not have this fixation on being with other people, pretty much all the time (because most people are scared to be alone). Its as if other people can get rid of our thoughts about being alone and cure loneliness, among other benefits that some people believe others can provide.
I am at home and alone almost all the time and love every minute of it. I work on a couple of personal projects, when I wish to, but I do not feel the need to be "into" anything. What I spend my time on depends on what appeals, hour by hour, day by day. Some days I'll sleep a lot. Other days I will be up for 18 or more hours. It depends on my energy level, and other factors, which vary.
Perhaps one day something will come up that takes my interest and if so, I may choose to focus on that. Until and if that happens, I feel no compulsion or pressure at all to be "doing" anything that I don't wish to.
If you have not done so before, there is great benefit in doing nothing, something that everyone can benefit from. But in the world we live in, with its almost endless and vehement obsession and fixation with production and the ever present invented things like "achievement", "progress", "development" and other such non existent things, doing nothing seems to not get a look in very much.
If you want to understand what is creating any need for you to be "doing", you need to become aware of what thoughts you have. And you will probably find is that these thoughts are not your own.
We do not have to do anything really, beyond meeting our biological needs.
The bird, the flower, the lion, etc., all go about meeting their biological needs. But once that is done, the rest of the time they just loll about and are just fine being the bird, the flower, the lion, etc.
Just being is enough.
[Edit: fixed typos (in bold)]