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So, when I try to join/launch a singleplayer world in minecraft the game crashes at 96% loaded. This just started happening after I reinstalled Java and Minecraft after trying to fix a memory issue I had where I couldn't(probably still can't) allocate more RAM. Thing is that I can't even begin trying to get that issue fixed if the game won't launch. Any idea how to fix this? The issue has persisted through 2 reinstallations of MC now.

This is the latest crash report that I got:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Ouch. That hurt
Time: 2018-07-26 14:04Description: mouseClicked event handler
java.lang.OutOfMemoryError: Java heap space at ig.c(SourceFile:73) at cjq.c(SourceFile:34) at cfi.a(SourceFile:1470) at cmr.i(SourceFile:294) at cmr.e(SourceFile:223) at cmr.mouseClicked(SourceFile:164) at cgv.a(SourceFile:21) at cha.mouseClicked(SourceFile:278) at chf.mouseClicked(SourceFile:46) at cfk.b(SourceFile:83) at cfk$$Lambda$930/1229944013.run(Unknown Source) at cjs.a(SourceFile:430) at cfk.a(SourceFile:83) at cfk$$Lambda$780/1613361828.invoke(Unknown Source) at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) at org.lwjgl.system.JNI.invokeV(Native Method) at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3108) at cfs.a(SourceFile:320) at cfi.c(SourceFile:872) at cfi.a(SourceFile:392) at net.minecraft.client.main.Main.main(SourceFile:144)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
-- Head --Thread: Client threadStacktrace: at ig.c(SourceFile:73) at cjq.c(SourceFile:34) at cfi.a(SourceFile:1470) at cmr.i(SourceFile:294) at cmr.e(SourceFile:223) at cmr.mouseClicked(SourceFile:164) at cgv.a(SourceFile:21) at cha.mouseClicked(SourceFile:278) at chf.mouseClicked(SourceFile:46) at cfk.b(SourceFile:83) at cfk$$Lambda$930/1229944013.run(Unknown Source)
-- Affected screen --Details: Screen name: cmqStacktrace: at cjs.a(SourceFile:430) at cfk.a(SourceFile:83) at cfk$$Lambda$780/1613361828.invoke(Unknown Source) at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) at org.lwjgl.system.JNI.invokeV(Native Method) at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3108) at cfs.a(SourceFile:320) at cfi.c(SourceFile:872) at cfi.a(SourceFile:392) at net.minecraft.client.main.Main.main(SourceFile:144)
-- System Details --Details: Minecraft Version: 1.13 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 16973752 bytes (16 MB) / 268435456 bytes (256 MB) up to 268435456 bytes (256 MB) JVM Flags: 10 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M -Xmx256M Launched Version: 1.13 LWJGL: 3.1.6 build 14 OpenGL: GeForce GTX 970/PCIe/SSE2 GL version 4.6.0 NVIDIA 398.36, NVIDIA Corporation GL Caps: Using GL 1.3 multitexturing.Using GL 1.3 texture combiners.Using framebuffer objects because OpenGL 3.0 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: Current Language: English (US) Profiler Position: N/A (disabled) CPU: 12x Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz

You have -Xmx256M in the _JAVA_OPTIONS variable in your environment settings, To remedy this,

1. Uninstall Razer Synapse / Cortex if you have it
2. Press the Windows key and the Pause/Break key simultaneously
3. A window should popup, click on "Advanced system settings"
4. Click on "Environment Variables"
5. Delete the _JAVA_OPTIONS entry.

Thank you so much! That fixed both issues!