My Minecraft wont load

Put the summary of the bug you're having here

What I expected to happen was...:
My Minecraft would load

What actually happened was...:
I could go to the launcher but when i pressed play the screen went black.

Steps to Reproduce:
1. Press play on the Minecraft launcher

Here is the report

Minecraft Crash Report ----
// You're mean.

Time: 6/15/15 5:27 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 bml.a(SourceFile:360)
at bmh.b(SourceFile:100)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.a(SourceFile:99)
at ave.am(SourceFile:448)
at ave.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

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 bml.a(SourceFile:360)
at bmh.b(SourceFile:100)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.a(SourceFile:99)
at ave.am(SourceFile:448)

– Initialization –
Details:
Stacktrace:
at ave.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.7
Operating System: Mac OS X (x86_64) version 10.7.5
CPU: 8x Intel(R) Core(TM) i7-2600S CPU @ 2.80GHz
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 613816 bytes (0 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 1 total; -Xmx1g
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.7
LWJGL: 2.9.2
OpenGL: AMD Radeon HD 6770M OpenGL Engine GL version 2.1 ATI-7.32.12, ATI Technologies 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: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [PureBDcraft 512x MC18]
Current Language: English (US)
Profiler Position: N/A (disabled)