I have not been abroad to study, however, here are some things that you can consider:
Since you will be studying abroad for some time, it means that others may graduate before you. However, that is not to say you will be back on your own. It is always possible to make friends with students at different years throughout University. Also I am certain you will be able to find those who have an option to take a year abroad too.
Studying abroad is a really exciting opportunity, you get to experience the different cultures and environment, you are also likely to meet new people there. I do not think that your social life will be disrupted just by taking a year abroad.
Several of my friends are currently doing a year abroad: in Korea, America, and Hong Kong. So far they are really enjoying it, and if it is something that interests you, I would recommend trying it out.
I hope this helps.
University of Kent Student Rep