Morning!
Thank you for posting how you are feeling. It is always good to tell someone if you are feeling low.
None of us think you are worthless - or we would not have replied to you.
Life can be so hard, especially when the days are so short. Almost as if it is always dark.
I think it may be time for you to make yourself a cup of tea, settle yourself down and ring the doctor to make an appointment. Once you have an appointment with the doctor, then it would be good for you to be able to have a chat with someone while you are waiting to see your GP. As suggested, the Samaritans are good at listening. Are you a member of a church - could you talk to someone there? Have a look to see if there are any groups nearby that could help.
It is so hard to be able to talk to people, but you have already taken that first step by posting here. That takes courage and certainly not the actions of someone who is "worthless." The next step is making that appointment with your GP.
I will put the kettle on and have a cup of tea with you while you ring the doctors.