Should I get on finasteride or not?

[Petes]

Hi guys,
so finally I've my pills. I've been trying to find a trustworthy source and when I succeeded I ordered Penester(5mg finasteride). It has arrived today and I still can't decide whether I should start taking it or not. To give a bit more of insight on my current quandary : I'm a 17 years old boy who's been losing hair for about 3 years now I think. No male from my family is bald but I think I could end up being like NW3/NW4 - though without that bald circle at the top of head. The hair loss in my family is quite apparent but it's not the worst scenario - it's not like I'm gonna be completely bald (though you never know but I'm judging according to my brothers' father's and my grandfather's hair). My hair loss is not getting somehow visible - if I don't style my hair and even though I'm not losing my hair rapidly I'm losing my hair. The thing is I am kinda in between - it's enough to make me have a depression - but at the same time I know that I'm not gonna have a shiny scalp. And the question that's boggling my mind is : After I end taking finasteride can it increase my hair loss? Is it possible to lose more hair as you normally would when you get on finasteride and then just stop taking it? And as to the side effects - I'm not afraid - because should I experience them in any form I would quit finasteride immediately. So my question is: Could I by getting on finasteride and then stopping taking it lose more hair than I normally would without ever getting on it?
Thanks for your help.