My game crashes when I try to play single player.

When I press the single player in the main menu, the game crashes and shows this error:      The game crashed whilst mouseclicked event handler
Error: java.lang.OutOfMemoryError: Java heap space
Exit Code: -1

This is the crash report.

Minecraft Crash Report ----
// This doesn't make any sense!

Time: 10/19/20 11:23 PM
Description: mouseClicked event handler

java.lang.OutOfMemoryError: Java heap space
at java.util.ArrayList.<init>(ArrayList.java:152)
at com.google.common.collect.Lists.newArrayListWithCapacity(Lists.java:190)
at mj$1.a(SourceFile:47)
at mj$1.b(SourceFile:32)
at md.b(SourceFile:471)
at md.a(SourceFile:32)
at md$1.a(SourceFile:83)
at md$1.b(SourceFile:69)
at md.b(SourceFile:471)
at md.a(SourceFile:32)
at md$1.a(SourceFile:83)
at md$1.b(SourceFile:69)
at md.b(SourceFile:471)
at md.a(SourceFile:32)
at md$1.a(SourceFile:83)
at md$1.b(SourceFile:69)
at mn.a(SourceFile:108)
at mn.a(SourceFile:75)
at mn.a(SourceFile:32)
at mn.a(SourceFile:26)
at cyd.a(SourceFile:229)
at cyd$$Lambda$3037/1756268194.apply(Unknown Source)
at cyd.a(SourceFile:178)
at cyd.b(SourceFile:157)
at dse.a(SourceFile:91)
at dse.<init>(SourceFile:83)
at dsb.b(SourceFile:48)
at doq.b(SourceFile:325)
at djw.a(SourceFile:897)
at dov.d(SourceFile:141)
at dov$$Lambda$2714/1642006480.onPress(Unknown Source)
at dlg.b(SourceFile:33)

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

– Head –
Thread: Render thread
Stacktrace:
at java.util.ArrayList.<init>(ArrayList.java:152)
at com.google.common.collect.Lists.newArrayListWithCapacity(Lists.java:190)
at mj$1.a(SourceFile:47)
at mj$1.b(SourceFile:32)
at md.b(SourceFile:471)
at md.a(SourceFile:32)
at md$1.a(SourceFile:83)
at md$1.b(SourceFile:69)
at md.b(SourceFile:471)
at md.a(SourceFile:32)
at md$1.a(SourceFile:83)
at md$1.b(SourceFile:69)
at md.b(SourceFile:471)
at md.a(SourceFile:32)
at md$1.a(SourceFile:83)
at md$1.b(SourceFile:69)
at mn.a(SourceFile:108)
at mn.a(SourceFile:75)

– Affected screen –
Details:
Screen name: dov
Stacktrace:
at doq.a(SourceFile:438)
at djx.a(SourceFile:92)
at djx.c(SourceFile:162)
at djx$$Lambda$3022/925256968.run(Unknown Source)
at any.execute(SourceFile:94)
at djx.b(SourceFile:162)
at djx$$Lambda$2380/506751455.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:3174)
at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127)
at djw.e(SourceFile:1046)
at djw.e(SourceFile:656)
at net.minecraft.client.main.Main.main(SourceFile:215)

– System Details –
Details:
Minecraft Version: 1.16.3
Minecraft Version ID: 1.16.3
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: 514163208 bytes (490 MB) / 738197504 bytes (704 MB) up to 2147483648 bytes (2048 MB)
CPUs: 12
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Launched Version: 1.16.3
Backend library: LWJGL version 3.2.2 build 10
Backend API: AMD Radeon RX 5700 XT GL version 4.6.14736 Compatibility Profile Context 20.9.2 27.20.12031.1000, ATI Technologies Inc.
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Graphics mode: fancy
Resource Packs:
Current Language: English (US)
CPU: 12x AMD Ryzen 5 3600X 6-Core Processor