Rockets take too long to destroy vehicles?

So in the past couple of games I just played I got pumpled by tanks/helicopters. Why is because I only tried to destroy them lol but while trying too I just died too many times because it took to long to destroy them. For Helicopters whenever I use the homing rockets on them, they deploy their flares. And by the time I'm done reloading and shoot again they have flares again. :/

With tanks I just find it takes too dam long to destroy them, like it takes about 3/4 rpg/smaw before they are disabled ot destroyed and I just find it really slow because within that time they can drive away or kill me? Even using the javalen it takes about 2/3 but if the tank uses it's smoke screen it pretty much makes my rocket miss and so I have to wait even longer to kill it. ☹️

Anyone else find this relatedable or true?