Yes tilly I have felt all of the above, and still do! I guess I have learned to seek out people like me, I’m pretty normal I hasten to add
There will always be the popular type, who always have people flocking round them despite them not being particularly nice
I don’t think you need to make changes to you, I think you need to look at your thought processes. You see, people cannot dislike you if they don’t know you, so it’s nothing to do with who you are.
The school gate is probably the worst example of cliquey. You will find them huddled together, ignoring everyone who doesn’t fit their criteria, don’t worry, you don’t want to fit it!
I’m older now, but still have those feelings, I manage them better. Friendships take time to build up, you need to be consistent and constant. Find a group which is specifically for friendship, or where nice people go, walking groups are one. Have you thought about volunteering? Nice people, friendly, and, depending on her age, your DD may be able to go too.
There are some very good people out there OP, look in different places for company.