Can I really be allergic to alcohol?

As most of us are students it’s normal for us all to feel familiar with feeling rough/hungover or being sick. But I feel my problem is severe. I can’t tell if what I do is binge drinking or if alcohol truly doesn’t belong in my body. Every single time I drink alcohol whether that be a relaxed few pints at the pub or a full night out with around 15 units of alcohol, I am sick, I throw up everything I have drank and all food from the day (gross I know sorry). When I do have a night out and drink alcohol I always stick to one drink, but the next day all my friends are fine whilst I have my head down the toilet for the next 5 hours, being uncontrollably sick and very ill. I ask myself (knowing that the ultimate answer to the question is to stop drinking alcohol) do I have some allergy where my body rejects it? Or is it my mental state and possible binge drinking tendencies that affect me. Thanks.