My life is so perfect, but yet again I'm always sad for no reason. I always have a natural sad feeling, my parents always ask me why I'm sad and my response is always "I don't know", am I depressed?

Usually, if you are sad for a length of time and you don't know why is a clear indication of some level of depression.

No, being sad doesn't mean that you are depressed. Depression is way too strong a word to be compared with simply being sad. If your life is perfect, maybe you are sad because you are not challenged enough or struggled enough to know what it feels like to have achieved something and have that satisfaction of earning happiness. I do not know you, so this is just a guess and from my experience, just go out of your comfort zone and do something which you always wanted to do. Something that will become your passion, your drive, that will excite you, that will become your Ikigai.

Short answer, possibly. Depression is a constant feeling of sadness and loss of interest, which stops you from doing your normal activities. Different types of depression exist, with symptoms ranging from relatively minor to severe. Generally, depression does not result from a single event, but from a mix of events and factors. Sometimes, it's just a natural imbalance of chemicals in our brains that causes us to be depressed. I would recommend reaching out to a healthcare professional, any doctor, psychiatrist, or psychologist will do, and tell them how you're feeling. They can get you set up with the right tools to start feeling better.