proxy not working in burpsuit or something else ..?

im using kali 2016 in vbox, burpsuit, bitnami LAMP stack for apache/php/mysql ok so now since im using bitnami lamp,my "http://localhost or 127.0.0.1 or 10.0.2.15" takes me to bitnami page localhost/phpmyadmin/joomla gets me to my website i am working on.

Now, I have to intercept the traffic of this website into burp, so for that i need to use proxies..

i put 127.0.0.1 port: 8080 or 7200 in browser (also select use for all) and i put the same thing in burpsuit proxy listners ----> i get nothing in burp

then i add this: burpsuit-->proxy-->options-->proxy listners add ip 10.0.2.15 port 7200 and listen to ONly this

this is what i get in burp http://ift.tt/2neygXU

request to http://ift.tt/vzAUz3
GET http://ift.tt/OIiP2w HTTP/1.1
Host: fonts.googleapis.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0 Iceweasel/43.0.4
Accept: text/css,*/*;q=0.1
Accept-Language: en-US,en;q=0.5
Referer: http://localhost/phpmyadmin/joomla363/index.php/log-out?view=registration
Connection: close

and in the "Alerts" tab of burpsuit i keep getting all the entries "failed to connect to proxy server " if i use any upstream proxy servers.

where from this fonts.googleapis gets called from??

also why am i not able to get anything on 127.0.0.1 in burp ? i shpuld be getting a lot of other stuff here but im not able to get that. if i use wireshark i do see a lot of traffic but i dont know how to interpret that or use it instead of burp.

whats happening here..