Future planned for me... HELP ME!!

So I wanted to be a doctor when I grew up. So I signed up for Gordon Cooper. My mum and I went to Gordon Cooper for the open night and we talking to the people and signed up. On the way home, she yelled me for forty five minutes because as she put it " I am going to fail and need to pick a more realistic job" because apparently she tried to be a doctor and she got over whelmed by everything. At home, her husband told me that since I am good on computers that I should become a computer technician. I don't want to do that! I don't know what to do! Can anyone give me some advice!?!?!? I am so confused and stressed!