Speaking as someone who has suffered from depression and anxiety all her life, SSRI medications work for me. Canceling appointments is a sign you need to keep the appointment. Remember, just because you go to the doctor, that doesn't mean that you HAVE to take the medication. Have a discussion with a medical professional, ask all your questions, express all your concerns, then make a decision.
Depression is not about feeling a little sad, or not being able to have fun. It's an illness that affects every part of your life, and sometimes you need medication to correct a genetic imbalance. I've only been on an SSRI for 4 years, and I only regret that I didn't get on it sooner. I'm not a different person because of it, and it is not a band-aid on some imaginary problem. I feel like I can finally be the person I knew I was, but my brain chemistry was blunting. I worry that some comments here are exactly the kinds of things that make you concerned about seeing a doctor. Seeking medical help is responsible. Good luck!