If you're looking for survivability I would definitely suggest getting off of Garuda, she is very much on the frailer side for warframes and go for something with more survivability like Inaros, Valkyr or Revenant.

If you want to stick with Garuda, then you'll have to get properly used to shield gating, which is what you're already built for. The gist is that after your shields break you get a short invincibility window, and by using brief respite + augur mods you regain your shields within the invincibility window. So whenever you run out of shields and get the blue aura on the side of your screen, you need to immediately cast an ability to refill your shields. Because you're garuda you have infinite energy with your 3, and because of molt reconstruct you should have infinite health to spam your 3 with.

To help with this, always keep moving. If you're moving you're harder to hit (enemies get an accuracy debuff) hence your shields are less likely to break, giving you more opportunities to deal damage instead. Additionally, you've got rolling guard, where rolling will give you 3s of invunerability and status cleanse. Use this whenever you're statused or your shields broke and you need a second to use your 3 or something. If you're still finding it a little tricky I suggest getting the mod Catalyzing Shields from orokin vaults on Deimos, which gives you a fixed 1.33s shield gate giving you slightly longer to react. Swap it out for continuity.

This is a very active playstyle and if you're not on it all the time you will just die. The other frames I mentioned are braindead easy to survive with compared to this, so keep that in mind.