Wanting an abortion, but my boyfriend has already told everyone I'm pregnant

Feeling upset and trapped. My boyfriend told his parents, cousins, and coworkers that I am pregnant the minute I took a positive test even though I asked him not to share. I haven't told a single person other than my doctor because I'm so ashamed of myself for being careless when the time is not right for me to have a kid. I am 30 years old, I have my own home and a good, full-time career, but I am also in a part-time masters program, and I just don't feel like I can handle being pregnant while working/studying for 65 hours a week. I also cannot sleep without medication, so I am terrified that if I do have the baby, I will be responsible for any birth defects. This is my first pregnancy and I am so terrified to have an abortion, but I just can't handle the stress of all this. However, I still feel so guilty because I know I could provide for a baby even though the situation is not perfect. I wish I had just kept the whole thing to myself. I feel like if I go through with the abortion, I will have to break up with my boyfriend because I can't be around all these people who will know what I did. I just wish I had some privacy. Looking for any advice or opinions regarding my situation.