trying to find something wrong with him is pretty normal try to get to know him more
there is NO solid advice in shidduchim in the end it really is up to you and hashem
everyone has some flaw or another
dating (in my opinion) is trying to find the person with flaws you feel you can handle and/or even be happy with
when in doubt daven hashem wont let you down in the end anything he does will be what is right for you
good luck