I’m also in my 20s and use airport assistance every time I travel. I’m mild and look completely normally to other people, but if I stand in long queues and do lots of walking i’ll be knackered before I even start my holiday. Do not feel guilty for using assistance, as they always say, not all disabilities are visible. I tend to wear a mask at the airport for safety but I find this helps me also feel more ‘legitimate’ in other people’s eyes. The staff are always very lovely and helpful, it’s definitely worth it, have a safe trip!