Should I Play The Najdorf Sicilian as black as a 1475?

No. Please don't, I beg you.

I've lost a lot of games playing this when white castles Q side and I might well stop playing it. Problem is that I don't really know anything else that I like against e4. Suggestions welcome......

If you have studied it and you feel comfortable with it then you could start to play it on lichess to test the waters, e.g. in Blitz. If you get cut into ribbons you will learn from it. I recommend that you read "How to play the Sicilian Defence" by David Levy and Kevin O'Connell, it is a very good book that gives you "the feeling" for playing the Sicilian defence.

Good luck on your journey into interesting territory. Don't be afraid, if you get the feeling for it it is a lot of fun.

@Bellendo said ^

I've lost a lot of games playing this when white castles Q side and I might well stop playing it. Problem is that I don't really know anything else that I like against e4. Suggestions welcome......

Well you can try the Karo Cann Defence if you want a more solid defence that you can force upon your opponent.

I don't know if this is good advice...please don't shoot the messenger. My first instructor, years ago, started me on tactics and recommended I achieve some level of mastery before moving on to strategy. I was a bit impatient and attempted to learn strategy on my own (from a book). At the time, I decided that I would put it on the back burner. The books were too difficult. I have heard that some openings are more complex and require a greater understanding of the game before being tried out...my instructor also thought that I should stick to open games and master a few of them before going on to semi-closed and closed games. Another reason, I think, he wanted me to study open games is because they seem to occur a bit more often. Also, one can go from a closed game to an open one if the conditions are right (if one player allows the pawns to be ripped open). Anyway, I am open to the idea that I am incorrect. In fact, if I am wrong about one or more points, please correct me without trying to tear me down. I am barely above average in chess (on this site) and I am considered a beginner in the USCF. I will try not to post too many more responses, if I get shot down. Thanks.

A tip for Sicilian players:

You can avoid the Smith-Morra Gambit by playing:

e4 c5
d4 cxd4
c3 Nf6

Transposing into the Nf6-Alapin.

And do play the Nf6-Alapin, not the d5-Alapin, when White plays 2.c3 - it shrinks your opening book by one line.