So im trying to make my first render and im using the polygon lasso tool in ps and as im going around it atomaticlly thinks im done and connects it back together when im not ready!! its getting really frustrating and dont know what im doing wrong can someone help?

Why not use the pen tool? It's 50x easier and better!

There are multiple methods you can use for cutting a render out.
Are you using the regular lasso tool or polygon?
Because polygon doesn't link back to start unless you join it there.

You can try zooming in and using a soft brush to erase also.

i used the eraese Method For so Long lol

then figured that the Lasso tool worked out

and never got the hang or never really figured out how to use the damn Pen tool.