Loneliness is primarily a psychological state. A person who spends a lot of time alone, and is ok with that, is not lonely. Conversely, there are people who say they feel lonely even when they are in the company of others.

Since you don’t seem to have a problem with spending time alone, you are not lonely and the purported* results of this study don’t apply to you.

*I am skeptical of this study’s validity but that is irrelevant to what constitutes ‘loneliness’.