Thanks for your query.You are 27 years old and your ultrasound
revealed prostate size of 35 cc.Normal volume of prostate is 20 to 22 cc.So it looks marginally enlarged You have not worry as long as you do not have symptoms related to prostate enlargement.Get your routine urine test done This enlargement could be due to Chronic Prostatitis
Please consult some Urologist
who will carry out( DRE).Digital Rectal Examination
to confirm the diagnosis.Take antibiotics like Doxycyclin twice a day for 3 weeks It will resolve the issue.