[GianFabien]

I'm an introvert, but my partner is an extrovert. I guess it gives me a good view of both extremes.

If you are feeling lonely, then perhaps you need to make changes in your life. Watch out where and when you feel lonely and try some changes. e.g. if you work from home, see if you can work from an office at least some of the time. If you live alone, try living in a share house. If you want to share with a partner, then get out and socialize, play a sport, take up some activity where you can be with like minded people.