game crashes when trying to play

I can launch the game just fine but whenever I click singleplayer it says "Saving World" and closes itself and then the launcher shows this error message

The game crashed whilst mouseclicked event handler
Error: java.lang.OutOfMemoryError: Java heap space
Exit Code: -1

the crash report says this 

Minecraft Crash Report -------- Minecraft Crash Report ----// Shall we play a game?
Time: 3/13/21 9:58 PMDescription: 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 cyg.a(SourceFile:229) at cyg$$Lambda$3001/889274961.apply(Unknown Source) at cyg.a(SourceFile:178) at cyg.b(SourceFile:157) at dsm.a(SourceFile:91) at dsm.<init>(SourceFile:83) at dsj.b(SourceFile:48) at dot.b(SourceFile:325) at djz.a(SourceFile:922) at doy.d(SourceFile:141) at doy$$Lambda$2682/1896985362.onPress(Unknown Source) at dlj.b(SourceFile:33)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Render threadStacktrace: 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)
– Affected screen --Details: Screen name: doyStacktrace: at dot.a(SourceFile:438) at dka.a(SourceFile:92) at dka.c(SourceFile:162) at dka$$Lambda$2987/235872963.run(Unknown Source) at aob.execute(SourceFile:94) at dka.b(SourceFile:162) at dka$$Lambda$2344/1979001148.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.glfwPollEvents(GLFW.java:3101) at com.mojang.blaze3d.systems.RenderSystem.flipFrame(SourceFile:102) at dez.e(SourceFile:308) at djz.e(SourceFile:1068) at djz.e(SourceFile:681) at net.minecraft.client.main.Main.main(SourceFile:215)
– System Details --Details: Minecraft Version: 1.16.5 Minecraft Version ID: 1.16.5 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: 481995424 bytes (459 MB) / 704643072 bytes (672 MB) up to 2147483648 bytes (2048 MB) CPUs: 4 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: 1.16.5 Backend library: LWJGL version 3.2.2 build 10 Backend API: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.5161, Intel 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: vanilla Current Language: English (Canada) CPU: 4x Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz

PLEASE HELP