Anyone have any tips to improve your confidence?

What specifically are you trying to improve in?

Mostly giving me the confidence to approach girls, but just generally, i want to be confident.

Well there are better ways to answer this. But a short answer, that really helped me is:

Realize that nothing you do is significant. Realize that you are just one out of 6 billion people on the earth. Realize that each one of these people care a million times more about what they are doing then what you are doing. Realize that if you fail at something, countless others have failed at the same thing. Realize that anything you can do can and will be forgotten when the next big thing happens. Realize that whatever you fear, there are fears out there that make yours look like a child's toy. Realize that whatever feelings that come over you when you face this fear is nothing but a simple physiological reponse brought on by emotional triggers in your brain.

So who the fuck cares but you? Do whatever the fuck you are going to do.

Damn you, thats my phsycology!!

you cannot control the situation ur in, just make the best of it. If u really feel like u wana go talk to a girl, do it, if u feel nervous then dont. Have a little more respect for what YOU want than what other people want you to be/do.

Honestly, you just gotta have a "I don't give a fuck" attitude.

and specially a "i dont give a fuck about confidence" attitude.

Just give it time. Specifically notice on yourself how you are different when you're with friends (aka on confident moments) and how you are when you are alone (not so much confidence is my guess), erase the differences.

or just think to yourself "why would anyone not like me?"

Its sort of like the not giving a fuck, but better