Any one else questioning everything?

I'm about 8 weeks now and have been going through so many mixed emotions. I'm sad and tired a lot. Neither is normal for me at all. I'm 25 and this is my first baby. Me and my bf only started dating 6 months ago and he's happy, but I keep wondering how much my life will change. I love him a lot but it's hard to know it will work out. I wanted to wait a few more years since we are still in the "honeymoon" period. I feel selfish at times and wish I could go out and have fun! Does anyone else have these feelings?