17 Weeks Pregnant, Depressed and Regret My Decision

Hello everyone. So a couple of months back, I posted about finding out I was 5 weeks pregnant and was terrified and didn't know what to do. I'm only 19 years old which made my decision that much harder. I decided that I would continue the pregnancy and take full responsibility. Problem is, now that time has passed and I have noticed so many changes in my body because of this pregnancy, it just seems all too real. I am understanding more and more that I can never have the life I had before. I will be so much more limited. I just don't know if I can really do this anymore. The baby's father is just so thrilled with this pregnancy that he doesn't understand. And because he is six years older than me, he's been able to do the things he's wanted. He's been through his partying days, going out whenever and all that. Just when I started having so much fun and freedom and got a car and had money, bam I'm pregnant. No more of this. And Last year and i had lost so much weight, a total of 107 pounds, and was feeling incredibly confident. I threw out all of my old clothes and now I'm starting not to fit any of the clothes I have now. I didn't even get to enjoy my new body for over a year. It saddens me so much. I guess what I'm complaining about is how incredibly life changing this is and I just can't handle it. Is there anyone going through anything like this? I would just like a little advice I guess. Negativity is not welcomed so please don't waste your time posting hurtful or unnecessary things.

Thank you all for taking the time to read this.