No, they are worried because you are not talking to them. They might think.something bad is going on and they want to know if you're ok. Out of drugs, you are not depressed, etc. Parents worry about their kids, no matter how old you are, you are always their number one priority, their baby. Know that, you should maybe talk to your parents and let them know you're ok and that there is nothing bad going on in your life, also if there is, you should tell them because they can help you. Also, let them know you love them and explain that you just enjoy being by yourself.