2 issues:
1. If you think you are already going bald, I would not use steroids, and use finasteride. Gear is expensive, and the results go away after using. The baldness will not go away. Look at all the retired pros: they are all small (except Dillet). Not worth the risk. Also, say you were to go bald at 30. Using steroids will make that occur ealier, 27, 25... Chicks want hair, they do not want muscle (all they want is a 6 pack!!) .
2. finasteride inhibits DHT, which I think, is responsible for test's androgenic actions. Using it will prevent balding, and growth of your prostate, and I would say inhibit test's affects on your muscles....to some extent.
I would stay clean, keep your hair longer, and be healthier.