Hello. I am 23 year old engineering final year student. I have problem of concentration I think my concentration is nearly 10%. I used to have good memory power but nowadays I always forget important work or thing to do. I always try to avoid anything that needs some thinking. Also I am addicted to nail biting, lips biting, cheek muscles biting and injuring my mouth. I also have masturbation habit of daily 1 to 2 times. I am unable to control it. I don't like anything whether it's visiting new places talking to someone. I keep myself alone. Also due to this week mental power I didn't get any job test cleared. Day by day it's getting worse. I tried to meditate a lot but my mind gets diverted to any incident of past or future. Please help me to get out of this.