How to not suck at rammus

Been playing league for like 2 months now and mainly play jungle. Recently picked up rammus cause he seemed simple and I like the idea of being ungovernable. I see people talking about how tanks he is but I just don't see it, whenever I go for ganks they just melt my teammates then I have no choice but die or run away. I constantly end up underlevelled cause I get no kills and my clear feels stupidly slow. Any advice?