How to get over the fears and worries..

I have so many worries which make me afraid. The worries are mostly related to future, will I get a job.. will I get a gf.. will I be settled and have kids?
So far (till my Masters and Ph.D) I always ignored those questions and lived in the present. I always was a good student with good grades because I never worried.. I always enjoyed doing whatever work I am doing and gave my 110% attention to it.
Now at the age of 30, I cannot live like I used to do. Although I am doing similar work that I did during my ph.d, I seem I do not like these works anymore. I do not like doing anything (work or fun). I am always tangled with these future thoughts, feels like my life will end without any good choice.
How can I stop worrying and enjoy my present doing whatever I loved to do.