No friends = boring summer

Im one of those people with not so many friends, and i hate it. Im friendly with people, but i only have 2 or 3 close friends that i actually hang out with. Its not that i dont like meeting new people, i just dont tend to ever get invited out with people, because no one considers me to be a close friend. To make matters worse, i recently broke up with my boyfriend, and even though we're still quite close, i dont see much of him either.

I just feel like this summer's going to be loooong and boring, and i really wish i could be one of those busy people who's always doing things and seeing people. I feel like such a loser when people ask what ive been up to and i have nothing to talk about, because ive literally done nothing.

Does anyone know what i mean? Like, im not unpopular, but i feel like as soon a school finished, people just forgot about me because i dont fit into any friendship groups.

I really want to keep myself busy over summer and see people, but im too shy to ask people if they wanna do stuff, because im scared it'll be awkward, or like im intruding on their groups. Any advice? xx