I just started sertraline 50mg but I’ve got imposter syndrome about if my anxiety/depression is bad enough to be on the medication - am I really depressed or anxious, and If not is it dangerous taking the meds

To clarify, I know I struggle with low mood and anxiety (social, health and general) but they aren’t overwhelmingly bad, like I don’t have panic attacks and I don’t feel suicidal - but I have been prescribed the medication after talking about my experiences with anxiety with the above - so I guess it must be bad enough for me to take the meds if my psych thinks so, I had already tried therapy and lifestyle changes and they didn’t necessarily help 100%

Anyone else been through a similar feeling?