Hi there and welcome Denise,
Do the following please to resolve this.
In Gmail, click on your name in the top right and click Sign Out.
Once done, then enter in your Correct Gmail address, not the new one, and your original password ***** this will get you into your original account again.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.