I'm a 36D but my breasts aren't together in the middle? What can I do?

I'm about to turn 16 and have a bra size of 36D. But my breasts are more on the side and not pulled together. I've read a lot about it and noticed that large breasts tend to be closer together. I have almost no cleavage unless I wear an undershirt or sports bra over my bra. Are there any ways to make my breasts come together in the middle more? Sorry it's such a strange question. When I asked my mother about it, she said that they'll probably get even larger (since she's a 40DD) and come together more when I hit about 18. Is this true? What can I do about it now? I'm sort of self-conscious about them because they're so big compared to the rest of my body. My measurements are 36-27-36. Any suggestions?