I'm currently 24 but had the surgery when I was 22. I had it on a Friday and was back to work the next Tuesday, where I moved slow but my coworkers knew I had had "abdominal surgery" so they were accommodating and helped lift anything I needed and understood when I couldn't do something. I haven't told the people at work yet, but all my friends and family know. My family knows primarily because the majority of them had gastric bypasses, so this was just another weight loss surgery to them, no worries there. My friends know because I'm not really ashamed of it. Before the surgery I was really shy and upset over my weight, but after I had it something instantly changed. I did it for me and I didn't care what they thought, and most of them were happy for me and ask about my progress. Heck, some people even forget that I had it and ask me why I'm not eating very much!
I got back into dating a year and a half ago (about 6 months post surgery). I felt extra confident in my new weight, even though at 210ish I was definitely not skinny! First dates I chose not to do a food date. If they suggested dinner, I suggested something more fun like going to an art walk downtown or just meeting for some coffee first. After the first and second dates, if I liked a guy, I said yes to the dinner date. If they commented on how much I was eating, I would tell them. If they didn't notice, it was up in the air whether I told them or not. It's more of a feeling you get, if they're going to be receptive or not. If they don't like fat people, then to hell with them! Fat people are awesome. I could not abide by someone saying they didn't like fat people when I was one of them.
You're doing a great thing by getting the surgery and changing your life. Your health conditions will improve and you will feel so much better about yourself and your body. It's okay to be scared, but know that what you are doing now will change your life forever. I whole heartedly encourage getting banded at a younger age, because it's just that much sooner that you will be able to get more joy out of your life, especially if you are experiencing health issues. After the initial recovery period, you are much like a normal 20-something. You can go out, you can do strenuous activities, and you have the added benefit of helping your health problems. It's a great life choice
Sorry if this is so long, I just really wanted to help encourage you! We can do anything we set our minds to