For me it was not an easy decision, so I completely understand how you are feeling. Accepting, and eventually embracing, the thought of having surgery was a long process. Deep down I knew I needed it, but emotionally it was a very difficult fact to face. Like you, I felt like a failure at first. While we all complain about the long waiting times on the NHS, I do on the one hand think that that is actually a good thing in a way when it comes to this particular surgery - because you really do need to prepare your head before rushing into it.
Waiting times from referral to surgery differ greatly from hospital to hospital, but roughly speaking they tend to be around a year. So if you have just had your first meeting I am assuming the milk diet they are putting you on is for tier 3 weight management rather than the pre-op LRD kind? If so, you still have plenty of time to process everything and make a decision on whether this is right for you or not.
For me, this forum helped a lot. None of my friends have gone through anything like this, so it was difficult for me to even conceptualise what having surgery meant. The more you read about other peoples' journeys, the more information you will have to make an informed decision. Talk to people, ask questions, and have an honest conversation with yourself about your weight and habits. Nobody really wants to go under the knife, what we all have in common is that we have come to realise it is the only thing that will work for our particular circumstances. We have tried and failed at everything else over and over again, and are doing this for our health. Whether or not you also fall into the category of people who need surgery - I don't know. There are people who can do it on their own, and I really wish I had been one of them. Unfortunately I am not, I needed the help. It would not be right for any of us to tell you what to do - only you will know what is right for you. What we can do, however, is share our stories and experiences. I personally had a gastric bypass rather than a sleeve, but there are plenty of sleevers on here who I am sure would be happy to answer any questions you might have x