<human>: So I have been working in my current job for about 18 months and I like it and get along with most of my co workers. We chat at breaks times about the usual things, news, weather, complaining about management, what we did at the weekend.

The problem? I have never mentioned my girlfriend to most of them. You never know how people will respond to you being in a same sex relationship and I just didn't feel like dealing with that in the workplace. Anyway after I was there a few months I saw that they would be cool with it and I started mentioning my girlfriend in one on one situations where it came up naturally e.g they asked who I went on a trip with and I said I went with my girlfriend. 

The few (maybe 4 out of 25 co workers) people I have mentioned have been surprised but fine with it but I have still never managed to mention her in a group setting. I don't like being the centre of attention and I know I would be if I did that. Also to be honest I am a bit embarrassed I left it so long, I realise it is a weird thing to do. Anyway, I kind of figured I would work it out/ get a new job in a year or two and it wouldn't be an issue.  

Then, my girlfriend proposed to me yesterday and I said yes! Yay! But now I really have to tell my co workers about the relationship because they are going to notice my ring/ I don't want to escalate this to a point where I get married without ever mentioning it. 

It's going to be awkward I know, but what is the best way to let them know without it being awkward/ making a big deal about it? I just want to enjoy my engagement not deal with all this!

Can you give me the gist of the text in a nutshell?
<bot>: I left it too long to mention my lesbian relationship to most co workers and now I am engaged. How can I tell them without it being awkward?