I play support for a few games every night, and then play some games on my main, Tracer. I feel your pain, and I inflict it. I want to note first, I play on console and I am mid at best. That said…
Supports are high value targets - eliminating you makes it infinitely easier to take down every other member of your team. If anyone isn’t focusing supports, imo, they’re doing it wrong.
All roles need to try to prioritize their own survival to produce value for their team - you aren’t healing if you’re dead - and staying alive is your responsibility. As a support, you should well know the sinking feeling of watching your teammates throw themselves into situations where they will surely die - it’s easy to spot in others and hard to see in ourselves.
So, if you consider yourself a noob, I would recommend Moira and Mercy. Both have excellent GTFO buttons when a dive comes knocking, and neither requires much aim skill. Moira specifically excels at taking out Genji in particular, so keep her in mind if a carry Genji is giving you trouble.
Lucio is strong all-around and generally challenging to land shots on, once his movement is mastered.
Kiriko and Baptiste are excellent duellists, have very strong cooldowns with immortality field and suzu (to negate Pulse Bombs). While Kiriko has an excellent GTFO button, both of their survivability comes more from how dangerous they are than their cooldowns. A Baptiste can kill a Tracer faster than the Tracer can get one clip off. So can Kiriko.
And that brings us to Ana and Zen. Ana and Zen are, like Bap and Kiri, high skill expression heroes. They rely entirely on their aim to survive - they survive only by being better shots and more tactically-minded than the enemies coming for them.
If you’re playing Zen or Ana and a Tracer is repeatedly killing you? That’s on you failing to hit your shots, and it’s time to switch to Brig, Moira, Kiri or Bap.
It takes a lot of practice and requires a lot of failures. Open yourself up to the expectation that you will fail. Repeatedly. Come to peace with it, and learn from each failure - and if you just wanna’ see a flanker die, please enjoy these clips of me beating the holy hell out of an enemy Tracer last night on Zenyatta.
Here’s hopin’ she learned something ^.^
Have fun! Practice practice practice!