Not completely your fault, Jax kinda sucks.

You need a good laning partner, and you need to get a couple kills during laning. Lizard buff helps a lot. Unfortunately, Shaco does it all a lot better.

Yeap failed miserably, team fights i get FF straight away. 1v1 Jax does great but i found i wasnt able to kill them fast enough before their teammates showed up or they got away. Ive seen some good Jax's and im not a bad player my self but i just cant seem to do anything with him. My 10 game winning streak has now been broken with my 5 game losing streak, all with Jax.

I wish i could sell him, took me ages to get that 3.1k points

Yeah it felt like i was Yi, but without the insane damage or anti-CC ult. Or like warwick without the lifesteal and stun-ult.

IMO the problem is that people look at Jax the wrong way. Why do I see comparisons with Yi/Warwick? Jax is not supposed to be a carry, he's more of an anti-carry type of character. I would place Udyr in the same category.

Your job will be to negate the DPS of physical carries (with repeated stuns) while bringing just enough damage to the table to help your team bring them down. Note that a carry's survivability is usually linked to their DPS (through lifesteal or being able to kill first) therefore you don't need as much damage to get rid of them if you do the first part (DPS negation) successfully.

IMO the way to build him would either be a tank build or an AP build. With the high dodge, stacking HP on Jax will make him very hard to kill. AP build is good because Jax has great AP ratios. You can try physical DPS, but you will simply become a weaker version of Yi by doing so. Personally, I do a hybrid tank/AP build that switches depending on the matchup.

A good jax can hunt and neutralise physical carries fairly easily, one important thing is that enemy minions are very often your friend as a JAX because they will give you the dodge you need (useful in the midgame),
apart from the that ,the only thing you really need is to just be faster then them, if you catch them in the open and you are faster then they are then they are practically already dead,

So as a Jax you need to constantly be looking out for when an enemy uses their escape move (trist's jump, flash, corki's valkyrie) and then make your move

Jax is essentially the Anti-Yi, he is one of the only characters who will completely shut down yi

Lichbane and Triforce? Triforce gives you a much better proc, and is generally superior in every way if Lichbane is the only AP item you're getting. Late game, a Lichbane will give you 80 more damage to an attack (110 with the TF AP), and only occurs once every 3s. A late game Triforce gives you up to around 170 more damage (yes, 50% more) with no cooldown (so Lich will never actually proc), so a leapstrike-counterattack combo will net you 340 extra damage instead of only 80. Only benefit to Lichbane is the greater mana and AP over Triforce, and there are better items for that on Jax IMO. A Frozen Heart will reduce incoming damage, gives more mana and a lot more armour as well as improved cooldowns (what's better, Counterstrike and Leapstrike doing more damage, or being able to use them more often?). It's been a while since I played Jax, but I'd almost be tempted to replace Lich with a second PD on that build.

Hey when you say

buy 2- ninja tabi/ phage

do you mean buy one or the other, or one THEN the other?