Losing faith

Hi everyone,
So, this weekend I was taking part in a swimming competition and I did rather well, beating my personal bests in 4 out of 6 of my races - great. However, where I was only knocking up to a second off my times, some of the other swimmers were getting huge personal bests and increasing the gap between myself and them. This made me question myself - am I good enough?
You can't be good at everything and I realise that the races I competed in were not my strongest events. But I found myself getting increasingly upset as others were doing exceptionally well and I was just doing alright. I began to think to myself 'this isn't going to go anywhere' and 'why am I wasting my time doing something I am not even good at?'
But this was a huge life lesson to me. I tried to rethink it and I found myself saying that even if I don't become an olympic champion and smash world records, does this mean I should doubt myself? I am still benefitting from my swimming and I enjoy it - it keeps me healthy, I have made lots of great friends and competitions allow me to see if my training has been paying off. Everyone will have good and bad moments, so why should I lose faith in myself because this one time I haven't done as well as I wanted to.
So, instead of wallowing in self-pity, I have decided that I will train hard so I can achieve what I want to. If I don't put the effort in beforehand, I won't come out with the result I want on the day.
I guess my message is, never doubt yourself. If you work hard and put the effort in, you will reap the rewards! In the end it is down to you. I know this is probably the cheesiest thing I've ever written, but it's helping me so I hope it helps at least somebody else:)

Speak soon...