I would encourage you to separate two issues – (1) “less observant” and (2) “modern”. These are not the same things. You need to analyze your family circumstance: what belongs to each of these categories. If you understand the difference, then you might (or not) discover that some of your family values are worth keeping. For example, a more modern schooling or family background may have prepared you better for challenges of interacting with outside world, workplace, etc. You may still want to change your approach to a different one after due consideration, but at least you need to show respect to your parent’s derech by not discarding it as inappropriate (if that is what it is).
So, if you can find value in your background, then you original question is similar to: how about a Yekke marrying a Litvak with less if undue low self-esteem.