1)It is good that you do not have friends to drink with coz that is the best way to becoming a drunkard.
  Consider that as a blessing in disguise.

2)Having many friends is way overrated. It is better to have a couple of good friends than tens of mere
  acquaintances. I have just 2 friends and they are overseas.

3)There are many things to do in life to keep you occupied. Try to volunteer, sports, gym, cycling, yoga,
  meditation, watching movies, listening to songs, etc.

4)Never lose your sense of humour. Once you lose that then you lose everything. Watch family guy, etc and if you
  dont find that funny read jokes online. You will find humour in almost everything once you change your
  perception.

5)Find a motivation in life and set a target goal. Be realistic. I have a target goal myself which i had told myself
  that i would achieve in 10 yrs. I could not achieve it. So i extended it by another 5 years and now i am closer to
  achieving it.

6)To be depressed is normal. Everyone has depression at some stage. The only difference being many find a way to cope
  and get over it naturally than through medications. Thankfully as Nepalese, our threshold for pain is higher and our
  ability to recover from pain is much higher.

7)If your gf is giving you a problem, deal with that in a mature way. If problems cannot be solved, it is better to
  move on. It is better for both. Plenty of fish in the sea for both.

8)The last book that i read was also years ago. Many people have this habit of losing interest in reading. This is
  normal. Do not force yourself to read. Once the interest comes back, you will slowly get back to it. Reading articles,
  news, etc online is also reading.

9)Have faith in God. Getting a divine perspective of life gives a newer meaning to life.

10)Each one of us comes with a single entry visa to this world. Some have it for a few days, some for 120 odd years.
   Life is unpredictable but short. Try to be happy and bring happiness to people around you. Keep away from greed,
   selfishness, aggression. When i was in Nepal there were a few times where i have let people cheat me fully knowing
   that i was being cheated. But of course i would tell them that i hoped they would not do that in future. I have never
   fought for money. I believe in karma. Nature has her own way of handling these things. And i was over paid on my first
   job here in USA. When i reported it, they asked me to keep it!. It was 1000 bucks!.

So cheer up brother. You are just 25. Life is a roller coaster ride filled with love but there will be pain as well.
Have patience. Good luck and all the best!. Do keep posting.