MY BROTHERS GOT A GF

I'm a 17f and my 17m brother got a GF (they met recently). I've always had a crush on him and he found out. Me and my other brother (he's 20) always thought that I was doing this just to get my brother's attention, but he's going out now and invited me to come with him (me and my elder brother, not just me). He told me that I'm just being clingy because he invited his friend and I responded with "do you think I'm jealous?".