You should absolutely not use steroids at such a young age, as the consequences may be very serious and long lasting. Your body is already going through a hormonal-rollercoaster, and steroids can get it completely crazy. At this age you are having your lifetime highest testosterone levels, which should allow you to achieve great results naturally. Besides, you would need more ancillaries than just N2Guard and a complete/proper PCT. Finally, a Dianabol solo cycle will not give you sustainable results, so it is quite pointless to run it solo. Usually, it should be used in conjuction with testosterone for results that you will be able to keep.