In terms of the miracles, it is only out-right miracles that are a problem, the type of miracles that are not going to happen to you no matter how much you daven, so you have nothing to worry about.
I think the issue is brought up in the Gemara in reference to a man whom a miracle happened to and he was able to nurse his baby (I don’t know the details, but I guess his wife must have died and he was desperate to feed his baby). Nothing like that is happening to you, so you have nothing to worry about. When “miracles” happen to you, take it as a sign that Hashem loves you. That’s what I do.
And always daven. You don’t lose out by davening. It is a Mitzvah to daven (and not just to say “I’ll be happy with whatever Hashem sends. We are not supposed to think that way – we are supposed to daven!).