It doesn't 'mean' anything. There are various takes on it. A quick story, though it isn't perfect, just get you thinking a bit. A king has two sons, the one son he loves completely, the other he gets really fed up with. they both have a royal quest to go on. The one he is fed up with walks in. Stop! Shouts the king, what do you want? To quest, my Lord. Very well, says the king, take whatever you need. Then the other more loved son comes in. The king pretends to ignore him. The son approaches. My Lord, might I ask a favour? What, answers the king. Eventually the king engages the loved son in discussion, and it takes a very long time, with the loved son trying to pursuade the king. The point is, it was harder for the loved son to get his request granted not because the king didn't love him, or didn't want him to get hurt. IT was because the king delighted in the loved son's presence.
This isn't a perfect answer, but remember, the reason why we pray isn't to get answers we want, it's because God delights in spending time with us. The more time we spend with him the more we tune into his way of thinking. The more we do that the more we find that we ask what he already wants to give us. the more that happens, the more we find prayers are answered.
Try this if you are struggling; stop asking so much. Instead, spend more time praising God and thinking and thanking him for how wonderful he is. One word prayers. He still loves you.