There is a small likelihood that it’s just a habit pattern as previously mentioned. However, I think it’s far more likely that your body’s natural inclination is the opposite of the majority of the rest of mankind since you mentioned being like this all your life.
You have a few choices. One has already been mentioned about trying to find a job that fits into a night schedule if you can possibly do that.
The other choice is to use a systematic gradual re-conditioning of your sleep-wake schedule by the use of therapeutic light boxes and an organized schedule. It’s not that easy but it can be done. However, similar to dieting, it must be consistently adhered to.
Do some research on “circadian rhythm” and you will find detailed descriptions of how this is done.
I have been a night owl since childhood so I know whereof I speak.
You could also see if there is any medical facility near you which has a sleep lab set up and may be able to pinpoint your situation more precisely. If you’re lucky, there may be one seeking volunteers for sleep research but if you have medical coverage this would qualify. These places also have sleep experts who can guide and supervise you and may even provide you with a light box as part of the process.
By the way, just using any old lamp or something will not get the job done because it needs to be a light with a specific type of bulbs and output. I’m not techy to be able to quote specs and such as I found out about this quite a while ago but decided not to pursue this method.
Whatever you do, it’s a bad idea to use prescription meds since they are all intended for temporary relief of insomnia. Our condition definitely is chronic rather than temporary and the risk of using these types of meds is that constant use runs a heavy risk of addiction and habituation. Plus, they almost all interfere with REM sleep and this messes everything up since you are no longer getting quality sleep.
Research has been done which proves that REM sleep is the stage which provides many of the therapeutic aspects of sleep and interfering with that is at your peril.
About the only thing I allow myself is the OTC product Benadryl which also helps my sinuses since it is an antihistamine.
Even tho our night owl circadian rhythms are not like the majority, we have plenty of company since about 30% of the population is in the same boat. So, it’s not “abnormal” per se, but the problem is that most scheduling is done by the early bird majority.
So, enjoy Fluther since there are so many self-professed night owls here. Certainly far more than I have encountered elsewhere. :)