Agree with SH. It isn't up to your husband or children to make your life exciting. You are only young why did you marry have have children with someone you don't love the way you are meant to? At one point you must of. Try and get some new hobbies or find interests outside of your marriage to keep your life exciting. Or even better involve your husband in these activities and work to get that excitement back. The excitement you are after does not last with ANYONE (think back to how you first felt about your husband) and by constantly desiring that you are not able to find happiness in the present moment. You say you are not unhappy but when you are in a place and would rather be somewhere else then that is cause of great suffering. Talk to him. You never know he could be feeling/thinking the same. Don't be afraid to communicate.
Some people are drains and some are radiators... Keep clear of the drains and hug the radiators!