I'm just curious how did they find out? Do you use your real name on your blog?
besides, at the age of 21, you are adult and you don't need their advice anymore....
I would suggest to stand up for your rights and show them that they can't control you anymore....I don't say to be disrespectful towards them, but be strong....
I remember that when I was at your age, my parents were giving me hard time for going hiking or to the gym or some other good activities....but I managed to convince them....It was difficult and they were so unreasonable, but it was learning curve for me too! Now, that I talk to my mom, she regrets about those days that she was so strict with me and my sisters....she says she just wanted to protect us and didn't know how! she even told me if it was now she would have give me more freedom.....I had to sneak out from home to go hiking with my friends....I love hiking and still doing it....hehehe.....
take care and don't be afraid of them....they can't do anything....and you are not doing anything wrong.....just stay strong
Marjan