I am glad it was Demo, but $100 on standard account is a ridiculously insufficient amount to trade forex with. Either use Cent if you have only $100, or you should not trade AT ALL if you cannot afford to risk more money.
You need at the very least $1000, but ideally I would not recommend less than $10,000 if you are a sensible trader.
You need to be smart and not predispose yourself to such unnecessary and easily averted failure.
Please be sensible and don't use such an insignificant amount. You will only fail otherwise.