This is my first grow and I am just learning things. I directly put my seed in bigger pot cause I was afraid of transplanting later. But I am carefull with watering. Last 3 days rain in my place so no direct sunlight.

I use soil and regulate PH even though some grower say you don't have to. With coco you have to regulate it between those values i stated. There is no buffer like with soil. From the picture it does not look like it has been stretching and outdoor light is what it is. You will know if she isn't getting enough light as she will start to grow rapidly upwards, increasing node space. You haven't got a diary so it is hard to really judge what else is going wrong. Your plant won't be drinking a lot, maybe 500ml a week. As long as you let her dry between waterings she will be fine.

Hi, without much more information than what you’ve added, it could be both things: overwatering and lack of light. How much water are you giving? What size pots? Why is there a lack of light? Are you regulating the pH? Provide more complete data, it could be both things you mentioned, the point is to solve the problem.