Your question would only be true if one is praying incorrectly. The act of supplication is one of humility and acceptance and resignation to the will of God. We cannot realize this until we let go the chains of materialism and selfishness. Once we achieve this, it is much more likely that ones prayers are answered, and amazingly, in greater abundance than that which was originally asked for!
We ask, hopefully for things that will benefit ours or others' souls. There is nothing in the world, materially speaking, that will be granted by prayer. This is a great error that many commit, particularly those who subscribe to a "prosperity theory" that is a very false doctrine. God provides all that we need.
Your statement: "We pray because our jealous mind cannot tolerate other’s success", would be an automatic cancellation of prayer being answered by God altogether. We should never incorporate feelings of jealousy and covetousness in our supplications. True prayer is a humble act that requires humility of self, and even though we do not get what we may want, requires that we thank God for all that we may possess at present. When one actually analyzes their present situation, with all truth, one usually finds that all that God has given them is most likely sufficient, and possibly beyond that, depending on ones' personal life philosophy and spiritual maturity.