Usually it's impossible to evaluate every circumstance and make a 100% rational and informed decision. And you are right that committing to something - walking down some path in life and staying responsible to your choice - closes other doors in life. This can lead to analysis paralysis, being stunned by the variety of options.
What you can gain by making up your mind and having a responsible commitment is that it can bring you to depths you have never seen or experienced before, which can lead to more happiness and self-development (spiritual development).
In many situations like choosing a life partner or a career path, you can only have a 'best guess', and the rest is actually made up by your own faith and hard work in deepening the relationship.
I recommend this (pop) psychology book which has some chapters touching on this topic. https://www.goodreads.com/book/show/347852.The_Road_Less_Tra...