Then you should probably practice some more! Watch some YouTube videos for Crucible tips if you need to; but if you're going into Trials of Osiris, you can't expect your team to carry you 100% of the way, which sounds like what you're asking for. You have to be able to pull some of your own weight; you gotta be able to support your teammates as best you can, stay alive, get at least some kills in, and revive your teammates when they go down. I'm not the best PvP player ever either, but I have my moments... and those moments can mean the difference between victory and defeat for your team.