“Astral projection” is something that’s done deliberately and consciously, or at the least the people who do it claim so. It’s related to new age, shamanism, magic, spiritism and it’s been around a long long time. You don’t want to go there.
Something that comes to you unbidden may be from God and it may not. It could be delusion, gift or deceit. Some of the best advice from saints is that it’s best to ignore whatever you can ignore and not get wrapped up in “experiences.” They can always be a deceit of the devil; there’s no real way to tell.
I’m not being disrespectful here but your average parish priest is not trained or equipped to accompany you on a prayer journey that includes this kind of stuff. If you haven’t, talk to a priest or nun in a contemplative order. Carmelites are really good to talk with and very down to earth. Even if you have to make a long drive, it would be worth it to your spirituality and peace of mind.
There’s too much mystical stuff going on these days, not just among new agers but also among Christians, particularly Catholics. It can’t all be legitimate. It’s so easy for someone who wants a close relationship with God to be terribly misled.