Age/stats/cycle history?
Steroids won't "cut" you up. Yes, there are some steroids that may aid in lowering your bodyfat, but very large majority of that is through diet and cardio. Some steroids may give you a harder, more vascular appearance.
In this situation, I think your best to focus on cardio/diet. There truly is no way around breaking your balls around a dedicated diet/cardio/weight training regime to get cut.