Still undecided

My parents came up this past weekend and surprised me for my birthday....had some friends over and we just ate pizza and chilled. It was good to see my family but im still not sure about this whole 20 years old thing. It just freaks me out....I'm half way through college, I have had a girlfried for three years.... I am about to be 20...what the hell....should i just go by my house and dog now? But on the other hand im like damn i only got a few more years I got to live it up....Either way this weekend was fun. Good to knwo ur friends got your back and it was nice to see the parents and sister again...Next weekend should b even better....sick