For good or ill, ganking is part of the game. CCP has decided that bad emotional responses are just as good for EVE as good ones, and they’ve also decided the economy needs as most destruction as they can manage.
Combat in EVE is, overall, clunky, awkward, slow to find, quick to finish, and not overly rewarding except in certain specific circumstances. As a result, there’s not as much of it as there should be in a space game featuring PvP. So CCP has a very broad acceptance standard for where and how PvP should happen. As far as they’re concerned, ganking by whatever method (whether single ship or multbox) is just fine.
Players have tried to alter CCP’s stance on it for 2 decades, it’s not likely to change. The best you can do is remain aware of the risks and how to reduce them. You’re newly back so you were likely doing something you felt is kinda relaxing and low risk, when along comes some gank squad.
Well, that’s irritating, but it’s basically your wake-up call. It’s a reminder that even though things may appear to be going smoothly in EVE, crap happens. Anywhere, any time. For many, that’s part of the attraction.
A few standard precautions and a certain amount of attention (ie., not watching some other screen for 10 minutes before coming back to EVE) are enough to enable most people to go years in high sec without getting ganked.
Google for “EVE Online how do I avoid ganks” and check some videos or links like the following:
Hope things go better in the future, good luck!