Count. Your. Blessings.
The only advice I wish I had been given earlier. Maybe people even did advise me, maybe I was too young to understand. When you are a teenager, life seems infinite, friendships seem to never end and loss is a concept far in the future. Whereas some of us had to suffer through losing people early, I was, thankfully, not one of them. I grew up sheltered, but with a good grip on reality.
But standing here now, a good 10 years later, I start to realize that growing up also means parting ways with many loved ones for different reasons. Some die too young, some pass away, some just take different paths in life than you do, some change and some might not understand your changes. I wish myself back a few years ago way too often.
So wherever you stand in life, count your blessings now. Be aware of the things you have. It may not be much to you now, but ten years in the future it will probably be all you wished you had.