How to know I can manifest

So I’ve been into manifestation for around 5 years now but I haven’t seen any of my manifestations come true.. I believe in the power of manifestation but I just sometimes feel so defeated that maybe this doesn’t work. Can somebody help me out and suggest a technique or something to try and manifest something small to make myself believe in it again..?? I really wish to manifest my dream life so please help me out..🙏🏻