Indrid,
I've never seen someone as paranoid as you when it comes to losing your hair, lol. (ive seen ur posts on bolex

If you're worried about losing your hair than refrain from using steroids. It's that simple. BTW I can run test and not lose one strand of hair. I find test to actually make my hair thicker. I wouldn't worry about losing hair on test. I would be more concerned of using winny,adrol,dbol, tren etc.
However, I'm just starting a test/deca/dbol cycle while being on propecia for about 5 months now. I know the whole myth about using deca and finasteride and it's reverse effect it can have on your hair, but I've also read some other stuff saying that it's over-exaggerated. Some people can still use finasteride while on deca and not lose hair. I'm going to try it out and see what happens. If I start seeing a significant amount of hair loss, I'm going to drop the deca and just run test + propecia. The bottom line is that if you're prone to losing your hair you will eventually lose it later on down the road. By using steroids now you're just accelerating the process especially at your young age of 21. If you're not prone to losing your hair, than a deca/test cycle should be the least of your worries.