Don't panic - you're not going to die...
But you should cut way back on the fast-food restaurants and junk food and start putting better fuel into your body. When you're young you can pretty much get away with anything, but your body will remember when you're in your 40s what you did when you were in your 20s and 30s....
Cut back on the saturated fats and include more vegetables (especially the green leafy ones) and fruits... And cut back on sweets...
By the way, if you did not fast at least 10 hours before they drew blood for your test, then the results are pretty meaningless. Did you tell the nurse that you ate lunch before the test??? You really need to have another test before you get all worked up - tell the doctor that you did not fast - and tell him what you ate in the 10-12 hours before the test....
I'm sure he'll demand that you take another test.
HubbleRules