How to overcome fear for lost of opportunity?

I get fear when I'm trying to choose something over buddhist teaching. 1. Listening to Dhamma instead of studying something else 2. Reject a job offer to get some free time 3. Not having relationship (with a person who have great qualities) because it increases clinging, lust etc. and it causes suffering My doubt is that those opportunities may help my journey to enlightenment. 1. Having a good job may make free time later 2. Good person may help me to understand buddhism more. So, How can I decide what to give up and what not to give up ? Prince Siddhartha gave up lot of great things. (Kindom, Wife, Parents). But I don't have such a great mind like him. I have ignorence. So how to overcome this fear? Did Lord Buddha mention these kind of situations in his teachings?