Lord have mercy.
I am sorry you are struggling so and feel worthless and alone. As painful as those emotions are, they are also very relatable, as people have since time immemorial struggled to find their way and purpose in life. Even Moses the prophet, when he was explicitly called by God to lead His people, thought of himself as unworthy for that role. Also the holy apostle St. Paul cried out in his epistle to the Romans "O wretched man that I am! Who will deliver me from this body of death?", because he was so grieved by his inability to walk the path that the Lord had put him on.
We do not take such people to be cowards, or losers, or useless, and really you are not either. But it is easy to begin thinking that if you have difficulty in your relations with your family, or with friends, or in society more generally. And sometimes we can spend a lot of time trying to figure out our way, and when it does not seem clear, or easy, or attainable, we begin to blame ourselves. It is not good, of course, but it is understandable. I know I certainly do that myself (to myself).
I don't want to pretend to have the answers beyond what our fathers and mothers in the faith have given us, though I do find them most helpful (for instance, for me praying the
Sunday Psali for the Lord Jesus expresses my own despair and need of help when I am too far down to find my own words). If you do not, of course you can find your own words, from your own heart. I am no expert, but I would think that continuing to talk is probably better than remaining alone in your own thoughts.
You may know it already, but here is a sermon from HH Pope Shenouda III about persevering with God in prayer that is a good reminder of the necessity of laying all your troubles before the Lord, Who wants to give you and all of us all the strength, direction, and hope that we lack.
May God be with you in everything and help and comfort you.