Question about Heaven...(possible paradox)?

Ok so I was thinking that if Heaven is perfect and free of sadness and lonlieness and fear and all that bad stuff, then what would happen if your family and friends didnt make it to heaven for some reason........does that mean you wouldnt be sad about it? and also i have a hard time beliving in perfection because i see life as kinda like a video game........its no fun if its too easy and you have no problems.......even thought adversity and hard times are a *****, arent they nescceary?