Bad Social Life

I'm currently a junior in high school, and Ive been frustrated because of my lack of a social life. I have friends, but they haven't invited me to anything in a long time, and at the same time, Im in a position where I cant really initiate a gathering myself(busy w school, already initiated the last one and dont want to make things one sided). So now im just stuck waiting for something to maybe happen while time is just going by. Im worried that Im missing out on my high school experience, and its just frustrating bc its so out of my control. Im also more of an academic student, so that also makes things hard at times as im often busy with schoolwork and stuff. Any advice?