Hi. Your GP is negligent.

Is there a Nurse Practitioner with peri menopausal knowledge, U could find out by contacting your Practice Manager. In the mean time, ask for a referral to a dedicated menopause clinic - many GPs still don't know that these exist. As there are waiting lists both in the NHS and private sectors, better to get a referral sooner rather than later - you can always cancel when the appt. arrives if you no longer require advice.
Browse round. Make notes ;-). Some find that keeping a mood/food/symptom diary of use to chart progress.
No one is too young! Some girls have a few periods then stop, others never menstruate at all - rare but it happens. Also we can go into peri at any age, there is supposedly a mean age of 51. However!!!!
Let us know how you get on. Keep posting, U R. not alone in these remarks from medics.
Lots of ladies go into peri 'early' U are not alone.