Could you go from having premature ejaculation to normal function once you get married?

Yes, options. Distract by thinking nonsexual thoughts. "stop and start":  stop stimulation before ejaculation for 30 seconds and restart. Repeat as desired. "squeeze" method: man or partner gently squeezes the end of penis (where the glans meets the shaft) for several seconds. Stop stimulation for 30 seconds, and restart . repeat as desired. Ssris such as prozac (fluoxetine). Use a condom and/or local anesthetic cream.
Not without help. Premature ejaculation can be aided by the "squeeze technique" employed by your partner when ejaculation is approaching. It involves a gentle squeeze of the head of the penis which can be practiced during foreplay to delay ejaculation.