I was 17 when i gave birth to my first child and im 32 and pregnant with my second just as scary at any age. The fact that you are worried will be a bad mum shows you already are going to be a good mum as you care.
Once your baby is here it will all cone naturally. You'll feel a love youve never felt before and you'll find a side of you that you didnt know was there.
Dont be afraid to ask for help if you arent coping though. Thats the best advice i can give. No one is going to think less of you if you do as it shows your wanting to do your best. Good luck
Hey im just 22yo and am 13 weeks and 3 days. I know its hard atm but you will learn alot and I mean alot along the way. My best friend was your age when she had her first she now has a beautiful happy and healthy baby girl and she felt the same as you. You'll be fine honey and dont forget there is always help available for young mums.
The fact that your already thinking about how to best take care of your baby is great! You're already taking your first step to being a good mom. Check out local women's centers or planned parenthood and ask about classes that they may offer. You're ob may have suggestions for you too. Knowledge is the best confidence booster! Don't be afraid to ask for help when you need it and do your best, I'm sure you'll do great.
Don't worry hun I felt that way too but I soon discovered that becoming a mother comes naturally