I been working out since March?

I was 114,very small,my biceps were ten inches,now there 12 inches,It's June shouldn't I be ''Jacked''? I work hard,train everything. Am I doing something wrong in my biceps exercise? I do standing barbell,dumbell curls,I can lift 40's now and I do 8 reps for size,strength. 12 reps for my triceps/ any tips?