Increasingly more often, I get emails from graduate students sending their CV and research interests, explaining they are looking for somebody to work with. Most of these emails seem to come from India or China. Usually, the student explains their interest in a topic that with high probability I have never worked on, and their inquiries inevitably start with "Dear Sir".
The first couple of times this happened, I took the time to write back they should please apply through the website like everybody else and good luck. These days I just delete such emails. I am trying to understand the situation these students must be in, writing to complete strangers in the hope to become part of the international research community, but still I have little sympathy for such mass emails. Why should I take the time to read somebody's CV if that somebody didn't even take enough time to figure I'm not a Sir.
Another type of emails I seem to receive more often the longer I managed to stick around are questions for advice. Usually high school students, and more often from Germany than not, they will ask what studying physics is like in reality, what it takes to become a physicist, what their chances are. I try my best to be answer their questions, but I honestly don't think I can give meaningful advice to people I don't even know.
Last week, I got an email from somebody explaining his talent seems to be more in the languages, but his interest more in physics, and what I think how relevant talent is for success in physics. I replied without hesitation that interest and the ability for self-motivation is more important than talent, because the latter can be replaced to a large extend by hard work, whereas the former is a prerequisite for everything. It occurred to me later though that this reply comes from somebody who never really had to work much for maths and physics at school, so that's easy to say for me. I have also met the occasional case of somebody who has been dedicated to physics and invested a lot of time and effort into learning, but just didn't get the most basic things straight.
However, I believe many people are actually pretty bad in knowing where their talents are, especially while still in their teenage years, and school performance in particular isn't very predictive. Doing research simply is a completely different story. You won't find out until you have tried, and if physics is where your interests are, you definitely should try.
I for my part was never very good in English. But then, how excited can you get about endless interpretations of George Orwell's 1984 and essays about the capital punishment in the USA. Ten years later, friends and relatives abuse me as a living English-German dictionary.