Sounds like you aren't combatting a rogue correctly. If they have the drop on you, you need space- fast or they will down you quickly as rogue is a DPS spec also. At 19 they aren't stunlock masters so you should be able to run. At 29 it's a different story.
Since you didn't say 19 or 29, these are just generic tactics I use. They work for me, but it's not 100% and it depends on who gets the drop on whom. Since we are talking BG, mobs are less of a factor.
If they have the drop on you, Wingclip, freeze trap and run/jump THROUGH the rogue. THey will have to spin and you will be at max speed, send your pet immediately. Use your radar or watch your icons if you have them set to range sensitive, always best indicator for when you can fire.
Once clear of the rogue do a jumping turn and let fly with a concussive arrow. Keep them slow and use terrain against them (great for running them across traps) even if they use speed while clipped, they will still be only about as fast as you are at a forward run. Nice time for a freeze trap if they avoided it before. If you don't have the ability, frost is nice to slow them up.
If you can freeze trap them, it will be over for them. Then you are on to aimed shot and your pet will be on them as you fire it.
Your pet should be chewing on them this whole time unless you freeze trapped them. If you can stay clear of them, they will not stand a chance.
If you are the initiator, setup, trap protect yourself and if you have time [clueless foe] and a cat, prowl is great revenge... Send your pet, Aimed, Scorpid, Concuss, and Arcane. They might not live past that rotation if you got lucky in damage. Keep the DoTs on them, then they can't vanish. Hunter's Mark is less effective against them, I don't know when rogues get the dismiss ability now, hopefully someone will chime in. I just don't rely on it any more.
All this sounds easy to do but in actual play, it's hard. It will take practice- lots of it. It is possible to do. I've dropped rogues that were 4 levels higher than me and they were fighting competantly, I just got luckier in damage and timing. BM hunters should rip a rogue to shreds. MM it's harder unless you get the crits going your way. High enough of a crit off MM can almost 1 shot most rogue players with an aimed shot. Done this before too, but to clothies. Two shotted a rogue once in a BG.
Hope this helps, I am not a PvP expert and others will likely have better techniques. Just keep practicing.