As Eastern European I recommend returning in GW2 after so many years you haven't played would be one of your best decisions. The game mostly has mature enough people to chat and play with.
If you don't have any friends now, you Will find in GW2. There are many good people here.
The content that gw2 gives you will be enough.
Yes, don't constantly play, but a time reminders are good for you to let you see how much hours you have spent.
So if you do have friends, why not going out with them if they are near you?
Going on a hiking is a good idea too. The Nature would refresh you. If you can, go each week on a hiking trip. 2-3-4 hours would be awesome.
Don't forget to treat yourself like a discent person. Dress good and comfortable, wash your skin, your clothes, eat good food and you everything will come on it's place.