Sharing Our Innermost Thoughts

I’ve been told quite a few times over the past 2 years by various people that they think I might have adhd. I’m a 16 year old girl and I just got back from an intensive backpacking trip in Costa Rica and the woman running the trip had adhd, and she pulled me aside one evening and asked if I had adhd and then said she really believed I did. This had been suggested by maybe like 2 other people before but I never really took much notice as at school I’m well behaved, fairly quiet and complete my work and get good grades. Although after speaking to this woman I’m starting to wonder if I do have adhd because I’ve always felt dumb as I feel like I find stuff hard that everyone else finds easy and I take longer to complete stuff, and I literally don’t learn anything at school in lessons, I just sit there, I learn everything at home. Also my bedroom is a terrible tip, it’s overwhelming and I don’t understand because I seem to spend hours tidying it but it’s never tidy. The reason I was pulled aside in Costa Rica was because she noticed I was always looking for stuff I’d lost, struggling to keep track of where stuff was in my backpack, which always made me late for group meetings, I kept misplacing stuff and also even though I try to listen when people are explaining lots of instructions I normally end up sort of zoning out and then not knowing the instructions, I get by in school though because I ask my friends and I’m well behaved so it goes unnoticed when I have no clue what’s going on. But at home and school I do manage to meet nearly all deadlines and keep organised enough to cope, but in Costa Rica all my routines and where I keep stuff obviously went all wrong and that was really hard for me and I very quickly became extremely disorganised, overwhelmed and stressed, and I kept losing everything. And every time it came to packing and unpacking my stupid backpack it was a massive challenge for me compared to everyone else. I really felt like there was something wrong with me and I was so stupid as I couldn’t keep track of anything and kept losing all my stuff, other people in the group were struggling with the physical side of the trip like hiking and stuff but I just struggled so much with organisation and no one else seemed to. I really don’t know if I have adhd, i don’t know much about it, I feel like I’m not that distracting naughty kid with adhd tho, and also I’m 16, surely if I had adhd it would have been really obvious by now and when I was younger?! Also I’m not really sure if it matters even if I do have it, like what could I even do about it??