I find this thread inspiring to me right now. I have often thought I have been feeling so lonely since I too don't have any physical friends being with, I know it can be tough at times. Although now I am thinking I should instead think of my online friends and other people I meet online as friends too, as well as focusing more on doing what is needed from me, and things which I enjoy doing, and spend more time and focus with my growth in Jesus Christ. This way a day will get greatly filled up!
Interaction with other people physically is nice too, I do talk with or greet people I meet outside during my walks, and can visit two older ladies for a nice conversation. So I should really start focusing more this way and then I won't think too much about feeling lonely. As the others have suggested in here for you too, it helps when you try looking at it from a positive side too. Although I also completely understand how "lonely" it can also feel sometimes, we can also "pray" for God to lead us or lead others who we can become good friends with too!
God bless you, and keep on holding to the joy in Christ Jesus!