SharePoint lists and libraries are accessible without any authentication

I am new to SharePoint development, I am building an internet facing website with anonymous permissions for the pages, my current situation is that my lists are accessible without any security upon them and when I tried adjusting the permission on the lists and libraries to have certain permissions my code couldn't read or write from the lists.

Can anyone help me achieve a point where the pages are accessible without SharePoint security while the lists and libraries aren't?

Here is an example of how I read from the lists

SPSecurity.RunWithElevatedPrivileges(delegate()
{
    using (SPSite newSite = new SPSite(SPControl.GetContextSite(Context).Url))
    {
        using (SPWeb web = newSite.RootWeb)
        {
            configurationslist = web.Lists[configurationListName];
            q.Query = "<Where>";
            q.Query += "<Eq>";
            q.Query += "<FieldRef Name='LinkTitle' />";
            q.Query += "<Value Type='Text'>" + key + "</Value>";
            q.Query += "</Eq>";
            q.Query += "</Where>";
            try
            {
                SPListItemCollection listCollection = configurationslist.GetItems(q);
                if (listCollection.Count > 0)
                {
                    foreach (SPListItem item in listCollection)
                    {
                        returnedValue = getStringValue(item["Value"]);
                        result = true;
                    }
                }
                else
                {
                    returnedValue = "";
                    result = false;
                }
            }
            catch (Exception e)
            {
                returnedValue = "";
                result = false;
            }
        }
    }
});