It's interesting to know that you can create Google account without @gmail.com . That means you can use your email address (other than *****@gmail.com) to access Google products and services.
For this follow the instruction given below:
1. Go to https://accounts.google.com/SignUpWithoutGmail and fill up details in the sign up form as shown in image below. We had used facebook email id to sign up, you can use any of your existing valid email id as Google will verify it. After filling details click Next.
2. Now Google will send a verification email to your email id (that you had typed in email address field).
3. The verification email looks like as shown in image below. Click the verification link to verify your email id.
4. Now you are ready to access Google products and services with your email id. The image given below shows that we are accessing YouTube with Facebook email id.
For any query feel free to comment below...