Friends going on holiday without me, do I have a right to be mad?

Okay so a couple of months ago I suggested that me and two close friends go away over the summer to a city in Europe, however the suggestions I made were deemed too expensive so nothing was planned.

However, my two close friends and another friend applied for interail travel passes in a competition, I couldn’t enter because I wasn’t 18 until the end of August. I didn’t even know they had applied. A couple of days ago friend A messaged me to say that they had won the passes and that they were devastated that I couldn’t go with them.

She then told me when they were planning on going, the dates meant that they would miss my 18th which they knew. I had told them weeks ago that we could go out for my birthday. I didn’t really want to celebrate with anyone else.

They messaged me to say that they wouldn’t go if I didn’t want them to but how could I be that friend? I’m just upset because I feel left out and annoyed because I really wanted to go away with them.
I am quite a calm person so I messaged back saying I was upset and that I was happy that they won and they just said sorry and that was it. I’m not sure they realise how upset I am.

I don’t want to seem petty but do I have a right to be mad?

Well. That’s kinda sad. I mean I wouldn’t leave a friend out. Don’t feel bad. You can feel mad and upset. But there’s not really much you could have done.