a lot of unasqued questions from a lurker that came out from the shadows

My point is, a monster that can deal at least more than a half of my hp scares me... I don't like tha idea of drinking a pot after every hit, becuase if I don't, 2 hits and I'm dead... are low hp classes like that? can monsters kill you in 2 hits most of the time while trasining normally?

I'm going to go ahead and say no, regular mobs will not kill you in 2 hits even as a low HP class, and if they do, that is easily remedied by some gear with high HP boosts, like Rex's earrings, Chaos boss equips or just plain old HP% from potential. Some bosses will most likely kill you in 2 hits though. But remeber this is because of the system where you will miss monsters above your level. You wont be going to bosses like HT before you at least match its level.