Extreemly Worried

Hi, i am 15 and i am white, i am worried as my foreskin is a darkish brown colour, i dont know if this is normal or not i am just worried as i have a girlfriend and if i start having sex etc with her she may think something is wrong with me, also where my pubes are attached to my scrotum there are small little pimples / lumps, i dont know if this is normal either,

please help

thanks