I recently overheard two of my friends, that they are planning to go on vacation next year together with another two or three friends of us. Well, overheard may be the wrong word in this context, they talked about it while we all were out enjoying some drinks.
I'd really enjoy going on vacation with them. Since they openly talked about it while we were going out I assume it's not like they don't want me to know about it or don't want me to come. However, they haven't asked me directly. Also, I got a well-payed job, and they know that. So something like "maybe they think I don't make enough money to join a vacation" flies out the window I guess. We hang out frequently and I don't feel like I'm the fifth wheel (or would be in the future). We have a great time together when we are going out.
How can I ask them about joining their vacation, without making it seem like I desperately want to go with them? If they don't want me to join, that's totally fine by me. But I think they just passed over/ignored me when planning their vacation. In your answer, please also consider if you would ask them all together or individually, and why.