Hi, your history suggests that you have milder form of sleep disorder hence we cannot put you into particular medical condition. There is a delayed onset of sleep. Even any recent stress or anxiety should be noted.
Once you sleep, your sleep architecture seems to be fine i.e. stages of sleep. You do not need any major therapeutic interventions for your condition. This is common when there is a disturbance in normal sleep pattern.
The therapy for this condition includes retaining of normal circadian rhythm by non-pharmacological therapy which includes; Photo therapy, maintenance of sleep hygiene. You need to go for morning exercises and work out which will make you fresh and active all day and tiredness at the end of day will help you to induce sleep naturally.
Pharmacological therapy includes short course of appropriate sedatives and Hypnotics against prescription. Non-benzodiazepines are effective in delayed onset sleep disorder and help to initiate the sleep.
I suggest you to consult physician. Take care and regards.
Problems with sleep are common for teens. A regular bedtime and rising time, every day of the week, including weekends may help.