Feeling like a failure ...

So I am a teen mother to two babies. After I had my son I did not return to school. I was so far behind and so unmotivated. Last year I had to watch the class and the friends I grew up with graduate without me. It was so hard. I feel like a failure. I was just lazy and ashamed of my baby body. I didn't want to be seen by people or leave my baby. I was also in a hostile relationship with a drug addict. But I feel those are still just excuses .. I wish everyday I could've graduated. I feel like I'll never be anyone or make a difference .. I will get my GED but it's no diploma. Any mama's feeling the same as me or in the same position?