Help needed with pasive tree, leap slam, heavy strike marauder

This is my first char, and I think I fucked it up. I'm currently at a3m, and I die way too much, I believe it's because I have only 3,3k life. I tried following a build guide, but I just took the closest passive point I could, I had no idea that you should chase life nodes first, and then branch out in DPS. Anyway, I have 18 refund points, so if anyone could just look at my passive tree and tell me which passive nodes should I refund so I can take life.

This is the guide I've been following: http://www.pathofexile.com/forum/view-thread/998229

And this is my passive tree: http://www.pathofexile.com/passive-skill-tree/AAAAAgEAAecCcQSzCZYOPBQgFE0UUhT2GJEZLho4GlUhAiE0IVUnCycgJy8n7Sz7Mok0jjboOQ46Uj38QqNHflBHUFRR5lQLVtlX4lhjWfNfP2DEYSFko2VNa9lsFnKpe4x82YM4g7aE2YY7hxmHaozPkFWQbJ7Fn8uiAKSspzCnhKloqXOplKyqtC-8n8AawQTG2Nlh45_kUel86wnsOO8O73zwH_Iv9kj8S__T

Thank you for your help!

I'm not too sure what you can do to salvage that build,

http://www.pathofexile.com/passive-skill-tree/AAAAAgEAxthYYz38jM_2SF8_458nL-8OvJ-krPIvqBhqHtIhVw3ZYRkuJ-38S2wWhxmsqnKpfNlZ88AaGenLQw4U3sGQVaeEGjjsOFfiMokEswJxFE2iAKlo8B9mnvrSNunjahcvhtEksICkns2nMBQgUEcYkRRxDjyfy8EEeWgLYXgNvooB3KQZG_ol34TZbmm-p9JNwA_V7WqTtkFOKiml4uphIYTvdO1672BLBS0=

^^
That is a bog standard groundslam/heavystrike/leap slam marauder build.
Basically, stack armour pieces with either flat armour, or preferably Arm/Evasion. Run this with Hatred + Grace (+Herald of Ashe if possible - you will need max level reduced mana gem plus the nodes at the top of the templar tree like that build I linked has.)

You don't need to fill both start paths of the Marauder, the defense path(bottom) is far more useful than the phys damage path above it, so get the 2 fire resist nodes at the bottom path, link up the build, then refund all the phys damage nodes, that will free up some skill points for you. Then try and alter your build to the one I linked, it will be possible with some regrets and some patience.

Unwavering Stance/Iron Reflexes is a very good combo, made even greater by your Grace aura.
You don't need that many damage nodes, the build I linked has plenty of free points to spend on damage if you should need it. But believe me, get a strong 2H Mace and the weapon can carry the build by itself, grouped with Hatred Aura (Cold) and Herald of Ash you will be dishing out alot of damage even before you spec into damage nodes.

Ok, thanks, I'll try that.