Stay further away.
Apart from Point Blank Shot which gives a fairly minor benefit, most of your feats likely won't require you to be that close. It is a shame that you can't bypass this feat, but it is a requirement for Precise Shot which is practically mandatory. Improved Precise Shot becomes available at level 11 normally, but isn't compulsory.
A Composite Longbow (You do have at least Strength 10, right?) has a whopping 110ft range increment which puts you well out of charge range of most enemies before you even start taking to-hit penalties.
Precise Shot and Rapid Shot, which are likely to be your bread-and-butter feats, have no requirement to be close to an enemy and you can even pick up Far Shot if you want to stay even further away.
You may also wish to consider any magic items that increase your speed or grant 'free' move actions so that you can keep moving whilst firing. Alternatively, some way of gaining Greater Invisibility or Blur effects can make you harder to hit/detect.
This is trickier.
I would recommend buying a wand of Sniper's Shot which allows you to make Ranged Sneak Attacks at unlimited range. It will only last 1 round at a time, but you can cast it as a Swift Action (Rules Compendium, page 9, note 2) so should always be able to have it available as needed.
If you put a Wand Chamber (see Dungeonscape) into your bow then you can activate the Wand whilst still wielding your weapon too.
This should allow you to keep your distance.
If you wanted to have access to multiple wands, such a as Wand of Golem/Vine Strike, then it may be beneficial to have a Wand Bracelet (Magic Item Compendium) which allows you to store several wands and draw them as a swift Action. This lets you swap over the wand in your Wand Chamber as needed at the cost of an action.
This does give you an issue where you can't Sneak Attack from over 30ft versus Plants/Golems etc. If this is a deal-breaker for you then....
Switch to Crossbows
The Crossbow Sniper feat allows you to Sneak Attack at 60ft range, as well as getting bonus damage,. at the cost of needing the Weapon Focus feat first. A Light Crossbow with Rapid Reload will also allow you to make full iterative attacks.
Get a Continuous Magic Item
This will need to be cleared with a GM first, but you could create a COntinuous Magic Item of Sniper's Shot for a meagre 8,000gp (CL 1 * Spell Level 1 * Duration in Rounds 4 * 2000).
Expect the rest of your party to start asking for Continuous True Strike though!