There's things you can purchase to help you in this department. There's penis sleeves, and penis extensions. It may take some looking into to find the right sizes for you, but I think you will find this useful. All hope is not lost here. To be honest, all you need is 4 inches to devour a woman's G-spot. I'm sure you can find sleeve/extensions to reach that. Not to mention, these items have bumps and grooves to help pleasure the partner.

I hope you find this useful to you now, or in the future.