So im 16 and want to have a girl heelp?

there's this guy i want to do it with but i got stretch marks on my that are very noticeable i only weigh 46 though hes had before will that make a difference to what he thinks of me i dont care i know its not love but i just want to have until the day comes i guess im not stupid btw i know what im puting myself into, all your answers will mean something thank you. guys can you pleaase answer this i need to see what your points are to this! thanks