Adversely, and in proportion to the number of trades you do.
For day-trading either spot forex or forex futures, it’s more or less essential (a) to trade where there are much lower spreads than that, and (b) to trade through a genuine broker (i.e. not someone “pretending to be a broker” while actually holding the other side of your positions: it would make little sense to be counterparty trading against someone who holds your funds, determines the prices and makes up all the rules as well! This is kind of “Daytrading 101” and without resolving it, the deck [I]will[/I] be firmly stacked against you. It really [I][U]is[/U][/I] about as simple as that. “Interactive Brokers” is a good place, if that helps.)