FTB Income and Security

My partner and I just took on a £461,000 mortgage (£2k a month) of a new build which needs all the flooring done as we didn't get this included.

We earn about £100k between us but live in the SE of England where it's very expensive! After paying the deposit and sols fees we have about £60k left is savings.

I feel like we have made a mistake taking on such a big mortgage, with our bills being about 60% of our monthly income and perhaps will lead ourselves spread too thinly. Especially when considering still having to pay to get married and have kids etc.

Wondered what other peoples situations have been as FTB and if we have made a mistake?