Possible alternatives in Life

I am Jetson 28 years old, originally from India currently doing PhD in Italy. I was diagnosed to have testicular cancer four years back and underwent extensive treatment. I am o.k. now and going for regular follow up.
Life has never been easy ever since the cancer and I do not want to make the life more complicated with relationships. I think the best thing for me to do is to stay alone and enjoy everyday live. I also believe that I could have a very meaningful life. What should be my pursuit in life apart from family life?