will I ever stop feeling like this

My emotions are all over the place. I found out was very anxious but then so happy. The last few weeks though I've just been nervous and very anxious not sure if I can do this or even if I'll be a good parent. I just can't seem to find myself getting happy or looking forward to it. I know I sound selfish but I'm just scared. Then I feel bad that I'm not really excited right now. Any advice? I'm about 8 weeks.