<human>: Can you condense the text into a few key points?

I am 24 year old, a Pharmacology major and currently working on completing my post-graduate studies. I also work part time (20 hours/week) in a university faculty lab, mostly conducting 1 person experiments and research reviews. This takes up most of my time. On top of it, I also have to take care of my 14 year old sister, who lives with me, because our parents are literally always travelling from country to country and never really cared for us. Finally, I'm also a competing bodybuilder, so I have to spend at least an hour everyday doing resistance and cardiovascular training. All of my time not spent studying, working or training is spent doing basic chores, such as preparing food, washing clothes, helping my sister with her homework and moving from one place to another throughout the day. I know it's usually said that 'I don't have time to do x' is the grownups' excuse, but in my case it's literally true.

But in the past couple months I've been feeling lonely. I'm 24 year old and I've never had a girlfriend, mostly because I've never spent enough time socializing. I look good, take care of my body and am in the prime of my adult life... I feel like I should go out and meet a nice girl that I share interests with, but like I said I physically don't have time and it's making me depressed. I also don't see many people in general, except for some colleagues, a few guys at my local gym whom I often talk with, and obviously my sister. Even though I truly love my job, my studies and my main hobby, I feel like there's something missing in my life and I don't know what to do, I don't know how to go about meeting someone let alone finding time to do that.
<bot>: 24 year old, no time to socialize (literally), never had a girlfriend and feeling increasingly lonely and depressed because of it. Don't know what to do.