All you need is an accurate birthtime and know where you were born and you are nearly there.
If you don’t know your birth time, then the best and most reliable way is possibly to contact the hospital your were born and ask for them to do a records search. This works a treat and while some hospitals may charge a fee for this service, others don’t. But remember, you will never be able to truly do an accurate astrology consultation without it.
Think of your time and your unique ID, even if you are a twin, chances are are that you were not born at “exactly” the same time.