I cant feel any happiness/relief when i achieve something good (like college degree, driving license). i wouldn't say i'm depressed. what should i do?

Maybe other things: are more important to you than the milestones you mention. Even so, there can be some satisfaction in achieving a goal. A mental health professional can help you sort this out. You may be depressed and this can be helped. The above gives you a better chance for happiness. Continue to value what is most important but have fun. Peace and good health.