I think the good news here is that you don't need to choose between the 2 systems. They aren't incompatible with each other. Epictetus near the beginning of his discourses says, "If only one could be properly convinced of this truth, that we're all first and foremost children of God, and that God is the father of both human beings and gods, I think one would never harbor any mean or ignoble thought about oneself" (1.3). He cites this as one of the fundamental reasons we are capable of understanding and cultivating virtue; we are the offspring of God. We don't need to make the ahistorical mistake of confusing the stoic god with Christ in order to see some significant overlap.

There may be some interpretations of Christianity that would frown upon finding answers outside of the faith, but it's been my experience that most strands of Christianity, including Catholicism, have little problem with it. Stoicism, despite having what most people today would describe as religious elements, is primarily a philosophy about living according to nature (a universal moral order) and seeking virtue. Most practicing stoics really only talk about stocism to other practicing stoics or to those seeking advice or information about stoicism. Otherwise we tend to go about it quietly in order to not draw undue attention to things that may or may not be useful to others. We all have our non-stoic communities as well.

As someone who has also struggled to find meaning in life from the very beginning, as well as to find a way of making meaningful changes, I feel for you and where you are. I would say go forward exploring both together, if you're legitimately drawn to both. If you feel like that's too much to take in all at once, you might choose one and pursue it for a while, then you might begin to explore the other later.

Both require a longterm commitment in order to find the real payoffs, but neither Christianity nor stoicism (in my experience) demand that a person go faster than they are able to, so you can take your time exploring both options. The crucial thing at this point is to go forward confidently at a reasonable pace.

Edit: as another redditor has pointed out, figure out what you believe regarding Jesus. If he is crucial to your new understanding of the world and beneficial to your emotional and moral health, then I think you know what you need to do; however, I still see no reason why stoicism couldn't help. I can't see all things, though.