I agree with the idea that op is overwhelmed rather than unhappy. I'd like to add a bit to the conversation though. I analyzed op's text with IBM's watson personality insights algorithm. Technically, you need about 3500 words for it to really have any good insight. However, I made my own assumptions about op before i read the insights results.

pfrisk. You seem like a very empathic person. However, you have some needs that must be addressed in order for you to be happy. You are obviously on an unstable road that leads no where. Unless you are planning on receiving a raise/promotion, something has to give. I dont know how you live your life, but it sounds like money is a big issue here. But here is the problem: dont be compulsive. Think and create a plan for your future. You need to find a way to save up some money break away. Why are you paying for some of your parents mortgage? You need to get over the feeling that you owe your parents anything. You are almost 21 years old and working at a supermarket. When your parents had you, they had an obligation to raise you until the age of 18. The only thing you owe them is your thanks and love, and neither of those come in the form of a mortgage.

Having empathy is a curse and a blessing. It shows that you are good person. But you may need to learn to be selfish.

You really need to figure out what you want most. The hardest thing in life is understanding yourself. Once you figure out what you want in your life, you are unstoppable. People can change. A girlfriend may help motivate you. But motivation is transient and superficial. Move slow, but with purpose, so that you may change your path along the way.