I checked your match history. Don't ever, ever, rush attack speed on Tristana. It's a noob trap. Avoid this item 100% of the time: 
If you are playing her as an ADC, you're going to start with Doran blade every time. Then DAMAGE. I'll try to give you a basic build order below:
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Doran blade > Pickaxe OR B.F. Sword > boots > Infinity Edge > Berserker's Greaves > Avarice Blade > Zeal > Statikk Shiv
(You CAN get the Statikk Shiv pieces in a different order if you want.)
You build these next, depending on what you need first:
- Last Whisper, if the enemy has lots of armor (check their items)
- Banshee's Veil, if the enemy has lots of magic damage or stuns that you need to avoid
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- Quicksilver Sash/Mercurial Scimitar, If the enemy has suppression champions (Warwick, Skarner, Malzahar), Zed, or hard CC that you need to cleanse out of. Like an Ashe ultimate.
How to not feed? Do NOT use your W to jump into a fight. Use it as your escape. The only time you want to W is if the enemy is so low that you know you will kill them and get a reset to jump back out. Use your E for harassing your opponent, and back away after you cast it. Farm, farm, farm. Tristana is only strong at level 1-2, and at 6. Then she is weak unless you got fed by level 6, so focus on farming up your gold.
Your general ADC mentality should be to stay alive while doing as much damage as you can to the closest enemy near you. Do not chase, do not go into fights first, and try to shoot people from your maximum range.