Have you been with anyone that can accommodate you or at least tries? You may find that the young girls WILL be scared of such a large penis, I'm 38 and that IS large.
You will need to reassure the female that you will go slow so that there will be little pain. You should get some lubricant so that it makes it easier to penetrate and less painful. When you are that large it can become uncomfortable for the female which makes it undesirable which is why the lubricant, more foreplay beforehand will also make it easier as the female will be wet with her own lubricant as well.
I'm glad to know that you are aware of your large size. That makes me believe that you are a sensitive, caring guy that WILL take it slow with a female. IF she runs away scared then she was not the female for you anyways, as when you really care about someone then size becomes no issue and trust sets in.
Hope this helps