From me it is a massive NO NO NO NO NO to surgery!
Speaking from experience it is not all it is cracked up to be. You are not nearly at a high enough BMI to even be considered by the NHS and I would say any decent bariatric surgeon will also turn you down.
What type are you thinking? Balloon? Band? Sleeve? Bypass?
With every method you still need will power - just because you can't eat a lot will you be able to only eat small portions of good food - which will be hard to digest. Or will you be unable to magically change your eating habits just because you have had some surgery and still eat crisps and chocolate which go down far easier.
Also be prepared to always, ALWAYS need to know where the nearest bathroom is - any food eaten in public can and often does make a swift reappearance. Never as nice second time round.
Oh and that's if you do ever eat out - as you can't eat more than a bowl of soup at a time and you can forget about being able to wash your food down with a drink. Only enough space for one or the other.
I am honestly speaking from personal experience - I am sure there are others who have had more success with surgery. But the people I have met along the way have had more bad than good. You don't get to be 23 stone + like I was without liking your food - and that really doesn't change just by getting 2/3rds of your stomach cut away.
Sorry if this sounds harsh but surgery is not an easy option - definitely go for something like Slimming World to start with. You need to try and change your eating habits - easier said than done I know!
First step is admitting to yourself that you want to change, so well done for that - making ca change is so hard, believe me I know
Good luck xx