Wow, I've never had a problem rolling joints, from the day I started. Even my first time I tried rolling it turned out well.

Maybe you're not filling it enough or you aren't packing it tight enough.

When I'm rolling I move from the middle to the outside forming the shape of the joint and yeah stuff does fall out the side and it's annoying but just keep rolling until it's packed quite a bit, roll downwards and tuck the paper under the bud against the other side of the paper and try to roll it tighter with a slight up and down motion to make sure it's tight. After that I take a pen or something and put it in the hole on the joint and push down to pack the weed tight (do it to both ends), then just put in a filter on one end and twist the other.