Thank you for reaching out to us again.
First of all: have you ever talked to a refugee legal aid service in Germany about your situation?
As you asked about finding an Ausbildung in your previous thread, have you already checked if there is anything you would like to apply for?
Since you mentioned that you have already received a rejection in Italy, and Germany has your finger-prints, it would unfortunately be impossible to apply for asylum in the UK. That is due to the Dublin III Regulations, which affect where you can apply for asylum or which country is responsible for your case. If you apply in the UK, the authorities will check the European database and find out you already applied in Italy/ lived and went to school in Germany. They may transfer you back then and will recognize one of these countries to be responsible for your case.
You can have a look at this or other threads on our platform for similar cases:
Can a rejected asylum seeker in the UK apply again in Italy?
I hope I could answer your question, please feel free to reach out to us again if you need further assistance!