Should I go for martial arts?

Question

You see I really hate the idea of getting hurt but I am able to move my feet in the way of kicking a person in the chest and in the knee very fast and I am able to throw about 17 straight punch's in a rapid motion in under 30 second's, But I am not sure if it would be good because I am not very strong I can only lift about 30 something pound's in each of my hand's but I can only do it 3 to 4 time's before my back start's to hurt me and I am some what calm in a fight I may be scared of getting hurt but I am able to stand my ground for a good amount of hit's but after so many I venture off from the fight.