You sound like a great person that has just hit a rough spot in your life. I am sorry your dad and step mom are so insensitive to your feelings sometimes words really do hurt even if they don't really mean to. I am sure you are loved by your dad just as much as your step moms kids. I think your parents mean well they just don't know how you feel in regards to what they are saying. Sometimes it's not what you say its how you say it! Lots of people do not understand depression, you will always hear just get over it. Well that does not work with real depression. I am glad you are seeing a doctor I am sure that will help you. Don't try and explain your self to your friends they may not understand or just be ready for that if you do. Hang in there things will get better!