I can't open Minecraft

When ever I open Minecraft it comes up with this:

Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 10/1/14 4:34 PM
Description: Initializing game

java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:59)
at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:397)
at java.awt.image.Raster.createWritableRaster(Raster.java:935)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1056)
at javax.imageio.ImageReader.getDestination(ImageReader.java:2879)
at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1263)
at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1560)
at javax.imageio.ImageIO.read(ImageIO.java:1422)
at javax.imageio.ImageIO.read(ImageIO.java:1326)
at cuj.a(SourceFile:360)
at cua.b(SourceFile:100)
at cua.a(SourceFile:77)
at cxh.j(SourceFile:553)
at cxh.a(SourceFile:139)
at cxk.a(SourceFile:23)
at cvt.a(SourceFile:99)
at bsu.aj(SourceFile:437)
at bsu.a(SourceFile:299)
at net.minecraft.client.main.Main.main(SourceFile:120)

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

– Head –
Stacktrace:
at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:59)
at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:397)
at java.awt.image.Raster.createWritableRaster(Raster.java:935)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1056)
at javax.imageio.ImageReader.getDestination(ImageReader.java:2879)
at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1263)
at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1560)
at javax.imageio.ImageIO.read(ImageIO.java:1422)
at javax.imageio.ImageIO.read(ImageIO.java:1326)
at cuj.a(SourceFile:360)
at cua.b(SourceFile:100)
at cua.a(SourceFile:77)
at cxh.j(SourceFile:553)
at cxh.a(SourceFile:139)
at cxk.a(SourceFile:23)
at cvt.a(SourceFile:99)
at bsu.aj(SourceFile:437)

– Initialization –
Details:
Stacktrace:
at bsu.a(SourceFile:299)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 1.8
Operating System: Mac OS X (x86_64) version 10.9.4
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 22832520 bytes (21 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8
LWJGL: 2.9.2
OpenGL: Intel HD Graphics 5000 OpenGL Engine GL version 2.1 INTEL-8.28.30, Intel Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [OzoCraft-1.7g.zip, Faithful Texture Pack 64x64 1, New Modern Craft, Sphax PureBDcraft 512x MC17]
Current Language: English (US)
Profiler Position: N/A (disabled)