Confession time... first time Mom

So I got pregnant unexpectedly. I’m 21. Career focused (or was before I got pregnant) not sure if I want to be with the baby’s dad...

I’m 12 weeks... it bad I sometimes think I don’t want this baby? Is that a normal feeling with an unplanned pregnancy? I know EVERY baby is a blessing and I could never have an abortion, but is it bad I’ve considered adoption because I wish this had all happened differently? I feel extremely selfish for feeling like this and quite frankly I beat myself up for it and ignore the feelings to the best of my ability. Most of the time I’m excited and happy about it. Other times I just don’t know if this is what I want.

Me and my SO are going to try to make this work and keep the baby. I guess I just want to know I’m not alone.. has any mom felt like this before? Is it just me? Any advice?

PS. I feel so bad for feeling like this-like the absolute shittiest person in the world so please no negativity.. I apologize if I offend anyone, that’s definitely not my intention.