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This task is impossible because if you add an odd number to an odd number you will always get an even number. We would need an odd number and an even number to make an odd number.
eg: 7+7=14, even 4+5=9, odd
9+9=18, even 3+2=5, odd
7+3=10, even 6+7=13, odd
If you use nine numbers it would be possible because nine is an odd number so you will have an odd number of odd numbers.
eg:1+1+1++7+5+5+5+5+7=37, nine numbers.
You wouldn`t be able to do it if you had an even number (eg: 8) of odd numbers because that would make four pairs of odd numbers, each making even numbers and thirty seven is an odd number.