I'm a boring and extremely shy and ugly 24 year old girl. I have very low self-esteem. I cry everyday for being myself. Is it possible for me to have a boyfriend?
It's probably not possible for you to have a healthy relationship in your current state of mind, but this one is all on you.
It's not your job to determine if you are enough for someone else. That's for them.
Your job is to be enough for yourself, and if there is something about yourself that you don't like, go and change it. Get interested in something, and you will be interesting, and it doesn't matter if it's particle physics or plumbing.
If you don't like the way you look, change it, or at least learn how to present at your best.
There are plenty of people who aren't “good looking” who are plenty attractive. It's because they don't put the attention on themselves.
Stop looking at yourself. Look instead at how you can make a difference in the world. Then go do it. You'll find your current question becomes irrelevant.