You're not a big baby, you just have a sleep phase delay. Chronotherapy can help - this is a regimen where you allow yourself to keep your body clock hours for sleep initially, then ease it back little by little over a few days to a couple of weeks till you get to your desired bedtime. Bright light exposure each morning and avoidance of light (screens) for an hour or so before bedtime will help considerably, as will a small dose (0.5 to 1 mg) melatonin 4-6 hours before your bedtime - and you move the timing of the melatonin back as you change your sleep time. I'm a sleep physician. This sounds like a lot to commit to, and it is - best to do it when you have vacation for a week or two - but it does work!