Oh, I missed that you don't own an iPhone. Sorry, you can't use Continuity Services with a Galaxy Note. It honestly doesn't make sense that you are getting your friends texts on your iPad unless the friends who are texting you are iPhone users and you are getting iMessage. You should NOT be getting text messages on your iPad from non-iPhone users.
On your iPad in Settings > Messages > Send and Receive
You should only see your Apple ID email address as where you can send and receive messages from. If you had an iPhone, you'd be able to send and receive from your cellular number as well, but since you don't own an iPhone, your cellular number won't communicate for text messages on iPad.