Size difference

Help! Im really worried because me and my boyfriend have a size difference. He’s a foot taller than me and his downstairs compartment is, well, bigger than anything I’ve ever had. We want to have sex soon but Im scared that I may not enjoy it because it will hurt. I want to do it but it’s important to me that we both enjoy the experience. We are long distance so he won’t be in town for very long. I just want to have a good time with him, any suggestions? The only thing I could think of was trying to find a toy.