I just seem to be crashing.

sorry forgot the crash report.

---- Minecraft Crash Report ----
// Why did you do that?

Time: 7/23/14 11:50 PM
Description: Tesselating block model

java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at csu.b(SourceFile:88)
	at chc.a(SourceFile:156)
	at cjs.a(SourceFile:254)
	at cjs.b(SourceFile:105)
	at cjs.a(SourceFile:45)
	at cjs.a(SourceFile:35)
	at cjq.a(SourceFile:62)
	at cmt.b(SourceFile:156)
	at cmm.a(SourceFile:71)
	at cmm.run(SourceFile:31)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at csu.b(SourceFile:88)
	at chc.a(SourceFile:156)
	at cjs.a(SourceFile:254)
	at cjs.b(SourceFile:105)

-- Block model being tesselated --
Details:
	Block: minecraft:grass[snowy=false]
	Block location: World: (-86,62,53), Chunk: (at 10,3,5 in -6,3; contains blocks -96,0,48 to -81,255,63), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Using AO: false
Stacktrace:
	at cjs.a(SourceFile:45)
	at cjs.a(SourceFile:35)

-- Block being tesselated --
Details:
	Block type: ID #2 (tile.grass // avk)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-86,62,53), Chunk: (at 10,3,5 in -6,3; contains blocks -96,0,48 to -81,255,63), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
	at cjq.a(SourceFile:62)
	at cmt.b(SourceFile:156)
	at cmm.a(SourceFile:71)
	at cmm.run(SourceFile:31)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w30b
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 14279216 bytes (13 MB) / 353280000 bytes (336 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95

Duplicate of MC-62984 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.

sorry yeah i just saw. i didn't know how to read the crash report

No worries, they can be the worst to check. I usually search the first piece with a line number (in this case "csu.b" no quotes) and see if anything pops up that looks close. Even then, it isn't a sure thing even for people with programming experience (I am not a Mojang developer so have no internal knowledge).