hearthealth……(more spitballing)…..could it be that you are dealing with social anxiety.....? with, maybe, a layer of low self esteem and self confidence...?
If so, these things can be dealt with....
For what it is worth....if one has the feeling of lonliness….that is not basic introversion...
If a person is invited to a gathering...and would like to go, but, is afraid/anxious about going..that is social anxiety....
If one is invited to a party and just doesn't want to go, and would much prefer to take a bath and read a book....that is introversion....
Introverts don't stay at home and complain of lonliness….they like being alone....