I Felt Like I Needed to Share This

My birth-dad was a good kid. He always did well in school and generally obeyed the rules until he turned 14 and fell in with the wrong crowd. Fast-forward to when I was born. I had been born out of wedlock (which, seeing as he was raised by a religious family, wasn't exactly smiled upon, but they didn't discriminate against him for it and still supported him). While my birth-mom was pregnant, both she and my birth-dad smoked, drank, and did drugs. My family has always had mild symptoms of ADHD, but it was never bad enough that it really caused problems. However, while ADHD is usually passed down genetically, it can also be caused through alcohol and drug abuse during pregnancy, which is the most likely reason for why my ADHD is so, for the lack of a better word, "bad" compared to that of most other people my age. My birth-parents also smoked and did drugs around me in the short time I lived with them. When I was only 3 days old I had to stay with my grandmother for some reason or another (most likely because my birth-parents were unable to take care of me at the time), and since then I've been living with her for nearly all of my life. My grandmother adopted me when I was only 22 months old, and she is now my mom. After I was adopted I lived happily, never saw my birth-mom (who apparently separated from my birth-dad soon after) again, and, although he sometimes came to visit, never really formed a bond with my birth-dad. Fast-forward again to when I was 9 years old. My birth-dad had another child out of wedlock with a different woman. Once again, they drank, smoked, and did drugs throughout the pregnancy and after my half-brother was born. They managed to keep a hold of him for a little under a year and a half before their drugs habits were brought to the attention of CPS and they tested my brother for drugs. They found that he had drugs in his system because his birth-parents had smoked around him so much. My mom (the one who was originally my grandmother) took him into our home, and eventually adopted him. My birth-dad and my brother's birth-mom split soon after. Fast-forward (again) several (okay, more than that) years later. My birth-dad recently died because he was doing drugs, overdosed, and had a seizure. At his memorial I of course cried and was sad. But people couldn't stop telling me how I'm just like him, and they still can't no matter what I do. I understand that I look like a small, female version of him. But they keep telling me how I act and think just like him, too. I know they don't mean to do this, but it makes me feel like they think I'm going to turn into a drug-addict and alcoholic just like him. I want to avoid the path he took as much as is physically possible. And it also makes me sad and frustrated that people consistently pay more attention to the fact that I'm "just like him" and not the fact that I'm me! It feels like they don't and won't care about whatever I do and will never pay attention to me and my accomplishments. I know I sound prideful, and I'm really trying not to, because I'm definetly not prideful. I just can't take how people keep asking me why I don't do certain things all because he did them. I just can't take how people can't look past the fact that I'm his look-alike and just look at me, and see that I can do my own things and make my own story. I know they're grieving, and it will take a while for them to accept that he's gone, but it really does hurt to feel this way (especially since I've already been able to accept his death and move on, because I know he wouldn't have wanted me to be so mournful that it kept me from seeing what's actually there). Am I being selfish? Am I right to feel this way? Am I overreacting? Has anybody else gone through something similar, whether it be the adoption or the death part? Would any of you mind sharing your stories, if so? Or perhaps a few comforting words of encouragement? I've gotten to the point where I think I might be mildly depressed (although I'm definitely going to talk to my therapist before I jump to any conclusions or freak out). I don't know what to do and I don't know how to handle this...