As a man you must bring something to the table to be a friend or have relationships with other people that’s just the cold hard truth. Just work on improving yourself to become a asset to others so you will be undeniable and loved by others.
"To have a good friend you must be a good friend"
To the question about muscle fatigue its probaly some sort of anxiety or stress related problem which comes with these negatives thoughts. Work on yourself till your the man you always needed when you needed him most.
Keep fighting you got this