So you think the EU is a good thing? Haave you seen “Brexit the Movie”? Seriously, you think the EU is good or what?
It depends entirely on your personal circumstances. If you are running a British company which exports goods or services to the EU then Brexit is likely to be very bad. (I have a friend who is the Managing Director of a medium sized British biotech company and we have discussed it at length.)
On the other hand, if you are an unemployed young person living in a run down post-industrial British city then Brexit is good, due to increased job opportunities and more accommodation availability.
But leaving the EU will damage the UK's GDP and it will take years for them to return to their current level of economic prosperity.