Please help me!! 20 and pregnant

I have just found out I am 2-3 weeks pregnant and I’m only 20 years old. My boyfriend is supporting whatever I decide to do. I never thought I would have a termination and always said it wouldn’t be devastating if I caught pregnant. Now I’m in the situation I’m so confused and scared! I’m worried that I haven’t lived life as much as I had wanted to yet, am I being selfish?!