It depend's why you are taking then, If you are taking them to help with the sport then you are a bad sportsman but if you take them to put on size/shred up just in general then you can go for your life. If you are under 25 you will not likely need steroids anyway as your natural testosterone levels should be sufficient as is.
Personally I don't think I will ever take drugs for athletic or body-building purposes but my predilections are not yours, so if you choose to do them then go ahead.