I completely relate to all of your feelings about this! I first started looking into WLS 15 years before I actually went through with it. I considered it many times over the course of those years, but the reason it took me so long to go through with it was exactly what you said -- I hated the thought of giving up everything that I loved. I couldn't imagine not eating a whole Red Baron pizza every week, or giving up my diet sodas. But I eventually reached a point where I had to choose between my health and continuing to eat the way I wanted, and that's when I went through with the surgery.
The first few months (including the pre-op diet) are HARD. It is a huge adjustment to make to your life, especially in the liquid/purees/soft foods stages. Even when you get to the "normal food" stage, it's hard to know what to eat because it feels like everything you want is now off-limits. I still have the occasional pangs of sadness when I see something that looks delicious and realize I can't have it.
I think the biggest surprise for me after surgery has been how little I miss my old diet. I have gradually discovered new, healthy recipes and foods that I never even would have tried back when I was eating pizza, french fries, pasta, ice cream, etc. I'm actually enjoying eating healthy food. I don't miss eating rice at all (in case you didn't know, most WLS patients don't eat rice because it expands in the stomach and can be painful) because I have found that cauliflower rice is a great substitute. I didn't even try it until my pre-op diet because I hated cauliflower, and now I eat it several times per week. I recently tried chia seed pudding and learned that I love it! I've started drinking tea since I quit carbonated beverages and now I'm discovering all kinds of delicious teas. I've found some great spice blends and sauces that make vegetables really tasty, and delicious light salad dressings. Can you believe I never tried sriracha before surgery, and now I love it (Huy Fong chili garlic sauce is even better).
I'm about 10 months out from surgery, so still in the honeymoon period, but my experience at this point has been that the adjustment to my diet has been easier than I expected. The hard part for me has been making time in my life to take care of myself and my health because I didn't really exercise before surgery, and now I'm devoting over an hour per day to it. I went years without ever going to a doctor (other than the dentist) and now I have to go a few times per year, get periodic bloodwork, keep my prescriptions filled, etc. I have to take my vitamins every day. It can all be a burden, but the tradeoff is that I am in the best health of my adult life, and not obese for the first time in my adult life. I'm not saying that WLS is right for everyone, but you know all the reasons you have decided to do this and whether it's worth all of the changes you'll have to make. Good luck!