This is frustrating and it's fine to feel bad about that experience but you have to take it as a lesson as well. Keep in mind that there will always be unlucky days and we're not in control of that because gambling is mostly luck-based. However, you must learn from what you experience by knowing your limits. If you're losing, it doesn't mean that you'll win if you'll bet continuously. You also have to set a certain limit and allocate enough funds for gambling so you'll know when to stop.