ITS!! NOT!! ROMANTIC!! AT!! ALL!!DO NOT make the OC have a mental illness such as depression (which is the most common in books and most mis-written) then suddenly have it cured by the love interest 2 minutes into them speaking.
Mental illnesses take a long time to recover from, possibly never so meeting one person isn't going to change that. Depending on what it is, it could possible make it worse.
Google the medication needed for it, find out as much about it as possible before writing so you don't look like an idiot.
Anxiety is another thing, as well as panic attacks. People truly suffer with them and it's quite off-putting when they're mentioned wrongly or are used in an incorrect way. Like if someone is just really nervous, don't say that their anxiety is playing up because that wouldn't be true. Everyone gets nervous, not everyone has anxiety.
YOU ARE READING
Dumb Teen Wolf Fanfic Moments
Random"It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue."