I have forgotten my security ques and answers but i need contacts

when registering to yahoomail its not me woh signed up but i gave my friend to sign up for me.so,he just gave me the id and password,not giving me security questions and i was comfortable myself not knowing that they are important.so, one day i wanted to change a password because it was known to a certain person.in the process i was shown that i changed the password successively and i was told to login to comfirm the new password,as i was trying to login,my yahoo id and the password were denied saying they were invalid.i tried the previous one but all the same it was the same invalid shown.After that,i thought of my contacts unfortunately no to be found and they are very important.my previous mail address was ali.aamna@yahoo.com and the password was 12345678 please ...help me as possible as you can.