Was it stupid of me to marry a younger guy?

I am 22 years old and I just got married to my husband who is 20 years old. I know he's only 2 years younger then me but I'm pretty mature for my age whereas he is SO immature for his age. At first I only started dating him b/c he is extremely goodlooking but the more I hungout with him I really liked his personality too. The thing is we dated for only 2 months and then I found out I was pregnant, we got married 4 months later and I am now 5 months pregnant with his baby. He's a really good person and I love him but I feel like we are constantly bickering and I don't know if it's just b/c of my pregnancy hormones or if we really just argue this much. Another thing is, he is SUCH a mommy's boy and I feel like he is constantly comparing me to her and making it seem like she does things better then me, whether its cooking or how I fold his laundry, etc. It drives me insane. Also, I feel like I'm constantly wanting to spend time with him but he would rather hangout with his friends, I know he's not cheating on me but it gets a little annoying after awhile that he would rather spend time or hangout with anyone instead of me. I know he loves me but I feel like he's unhappy. Not to mention that he is CONSTANTLY getting hit on by girls, he says "its not his fault and I can't blame him" but it drives me crazy! He also refuses to wear his wedding ring b/c "he doesn't like rings" but I want him to wear it so maybe the girls will stop hitting on him so much! This is going to sound horrible but I am starting to wonder if I made a really big mistake by marrying him. Is this arguing normal or do we fight too much? And also, should I be worried about him with other girls?