@Edwon1
You may well have arrived at the for you correct decision. You certainly have at this very moment in time.
If you remain at peace with your decision, it is the right one. Saves you a lot of money too.
If you however, in time, despite how you feel now, end up being „troubled“ by visions of weightless soaring amidst the earth‘s most amazing environment to the extent of even just remotely considering to maybe think about continuing to scuba dive, then re-read some of the comments here that, no matter how they come across, try to skew you towards thinking amd breathing „self reliant diver“. Imho, even more so when diving with a buddy you are responsible for on top of you being responsible for you, the simple truth that the training agencies forgo in order to attract more customers is: You either are self reliant or you are constantly at the edge of having to depend on, becoming a burden to somebody and none of that will even be remotely be as safe to your own health as becoming and being self reliant.
Things are worse yet - imho - with touristy follow the DM dives under the pretense that would be safe for some reason. There is very little a rushing (why do so many always rush @&%$§! DM can do to increase the safety of the diver struggling to keep up, 30... 40 meters behind the DM. Even the seasoned (or smart young) DM that makes the weakest diver in the group his/her buddy, will be troubled assisting another diver in trouble that is too far off. The DM that manages to keep a group so well together that no diver is too far off is rare. The random group of dive tourists that wants to dive that way is rarer yet. Everybody wants to explore their own nook and granny, take their own pictures, be away from the guy that kicks up silt... Maybe DMs always rush to minimize opportunities for „wandering off“.
Anyway. Long story short: A DM lead dive is only as safe a dive as you yourself make it.
There is no shame to practice with a buddy on a shore or lake, Heck, even pool dive..
Read up on self reliance. Practice. Try to find a similar minded buddy. If you cannot, find ways to practice at least one thing on each led dive. And don‘t ever dive in the open ocean not carrying a DSMB ever again and certainly don‘t use that as an excuse. Sounds harsh, I know. I mean well. I mean to tell you that you need to adjust your attitude in order to become safe. That is something you need to do. I know it is a very hard thing to do. The majority of divers do not think that way. For good diligent & attentive divers with good diligent & attentive buddies, that is not so bad. How many buddy pairs do you know that fit that description? even if you know some, what percentage of buddy pairs you observed fits that description. I seem to think that the vast majority are same ocean buddies and not really actual functional buddy pairs.
Diving like that in a group with a DM rarely adds safety. It can make things worse as it leads people to dive in conditions they are not ready for yet. Case in point: Is someone diving in the open ocean without carrying a DSMB and practised in it‘s use ready for diving in the open ocean? (Even if not underweighted?)
Once you manage to see a dive as your dive and your responsibility, even if DM led, you‘ll do well. See the DM as your navigator and thingy pointer outer and no more, and accept responsibility for all else yourself and you‘ll do well. Should the DM vanish, become incapacitated or, ... prepared to safely finish the dive and safely getting back to the boat or at the very least giving the boat a very good chance to come to you. You dove enough to witness some „what if“ scenarios. Being a age diver imho means to remain safe under ideally all, but certainly most what if scenarios. It also means knowing when to call the dive and then safely end it. Those two might be the most important skills. Ironically they are often more of a mental than an actual physical skill.
Anyway, for what it‘s worth, I invite you, like many others did. to embark yourself on the way of becoming a self reliant diver... even if you never plan to dive solo. Prior to subscribing, living and breathing that self reliant mindset, no matter what you may conclude from training agency materials, in my mind a diver is not truly safe. Once you are of that mind set and you for example choose to not dive with a pony and to rely on your buddies air supply for redundancy and do what it takes for that to be a good idea (like stick with your buddy... ad make sure his stuff works and is set up right etc..) it is a different dive experience for you than hopping of a boat hoping for the best. Once you choose to be in charge of your dive (even guided), you are. And you then are on the right way and trusting a random DM responsible not to you but a whole random group will appear as risk taking to you as it is (imho). Dive in that group, but take charge of your safety!