Sounds like all the people complaining are the problem themselves and don't see it lol.
"creep is almost always under enemy tower" ? What? ... steal your farm as void? What?
You don't steal farm as void, you get farm. You are a hard carry. If they are getting the farm, and you are a hard carry also, and believe you should be getting it, ask yourself this question "Why don't I get it". It is because you clearly cannot last hit well enough, so let them farm, because they are better than you.
If the creep is under the enemy tower, then learn to deny, block, pull, and stop auto attacking.
And queue with a friend once in a while.