Instead of looking at the photos and thinking "I look huge" remember how you felt on the day. You probably had a ball and married your DH.
Could you be overstudying the pictures???
At the end of the day, it's in the past and you need to move forward. If you want to lose weight, do it for you. Aim for that next dress size. Then when you get there, go for the next one.
I recently kicked my backside in gear and started running (normally wouldn't run unless I was being chased!!!) But I did it using the couch to 5 k app. Initially I'd to repeat the first few weeks as I was so unfit but I finished it!
Take small steps, jog to the next lampost, walk the next two. Jog.......
You could always aim to do a couples photoshoot on your first anniversary - it would give you a goal to have in mind!