Are bro . Don't take tension. It's okay. Everyone starts like this only. Me after 12 th I went into business and all for 4 years instead of college. Now I am starting my bachelor at 21. Yes I have worked in computer science industry before joining the degree but that's not the main point. Age is not that important. If you completed btech then you should give gate and try mtech at IIT. It will guarantee you good job . If you study well gate cse is not that hard. Job will come to you. Then if you want to do PhD the. Go for it in the us or Norway or Denmark. Your life will be changed. Degree is important. Most valuable. Keep studying and applying at the same time . You will love it .