Is it normal that my wife doesn't want to have sex anymore?

That sounds so much like a situation I had with an ex of mine. Went from regular sex to zero over the space of a couple of years.

It was her passive way of wanting the relationship to end even tho there was plenty of love between us - but zero affection and intimacy for the last 6 months of it.

I called her on it, nothing changed, so to cut the bullshit I made one of the hardest decisions of my life and ended it.

I'm not saying that's what you should do, but there's definitely a deep underlying issue with your wife. It's very unlikely to do with your dick size, as I'm pretty sure thats in the 'normal' range.

I'd say it's more likely to do with with what's happening in the space between her ears.

I'm very sorry for you. That sucks.
She can't tell you "We don't have a problem". That's not for her to decide. You clearly love her and she's being unfair. Maybe she doesen't want to tell you what's going on because she doesen't want to hurt you. But you NEED to know. I serioussly doubt it's your penis.
You have to flip this around:
YOU are making an effort, and she is not. YOU care about her being satisfied and she doesen't care about you. SHE needs to do something because you can't go on like this.
She needs to know that.
Your needs are just as important as hers.
I'm not saying she's not a good person. Maybe there are other issues you guys need to work on. But don't let her shut you out.

Something is clearly wrong. I fucked my ex well after our divorce. Sex has never been a problem and it is what most guys live for like me. Sex is very important for me. Being with a sexless woman is just not going to happen, she is gone with the wind. She may be having an affair but even so, I do not see why she would stop having sex with you. I think she just does not want to be in the relationship with you anymore. She is probably to insecure to admit this to you. Hell, tell her the rules and if she is not willing, then go your own ways. Life is just too short to share it with someone who does not understand your needs. I may sound a little hard, but like I said talk it out or move on. Life is just too short, besides there are plenty of women out there who do enjoy sex.

She found someone that fucks better.

It probably has nothing to do with your dick or efforts in the bedroom. She might feel insecure, unappreciated, misunderstood...try doing things unexpected and without the expectation of an instant return. Don't only pay attention to her when you want sex. Pay attention to the details. Stop watching too much porn. Put forth a genuine interest in her and you might get a return on it. 50/50 means you have to give 50% her way, not your impression of what she maybe wants ....sometimes ...possibly...occasionally...when YOU feel like it.

There are quite a few good comments here. An unlikely reason for her asexuality is that she is unconsciously gay, but has heterosexual sensibilities. This happens sometimes. She won't really be aware of it; but if this is the case, things will never get much better than they are. You could have separate bedrooms, jerk off, and learn to control the anger that forced celibacy eventually causes. Or, find a way to exit gracefully.

If you can live with a sexless life then just put up with it and carry on becos its not likely to change. If you can't then its time to move on. You could try counselling but I doubt that will help. Or you could see how she feels about a open marriage. There are no happy ending answers.

There are many problems here, but your dick isn't one of them. The key to any successful marriage: you have to make her feel more feminine, she has to make you feel more masculine. Be more masculine, don't be wishy-washy and don't use her as your emotional dishrag.

Be stoic and aloof, never back down and don't drown her in attention. Attention you give freely and easily is cheap, and when your commitment to her is a sure thing there's no excitement.

Talk to her, demand an answer. I fear that many women who aren´t that interested in sex just put up a show until they have the man and then they just drop it.

You aren´t a bad person for wanting regular sex.

Don't create a problem. If she has no interest on sex thn leave it. Take the taste of different girl which u will like more.

she has found a guy with a bigger cock than you

She's probably cheating on you.

If you're only 5.5 inches I'm surprised she married you! You can't satisfy a woman with that, she'll either found a better dick to fill her up or she just can't be bothered letting your little cock inside her, it's just not worth it for her

You can start by calling it what it is , a cock and then ask her if your cock doesnt satisfy her cunt , ass and mouth.
If thats the reason and she doesnt want to waste her time.

i mean sex really isn't the most important part of a relationship, but i understand where you are coming from and honestly if everything else is the same and you two are still very much in love and happy together, then i suggest asking her about it cautiously, its possible that she is asexual or just doesnt want it and if you love her then that is something you will have to respect, but its also possible that there could be more serious underlying emotional issues that you guys should work out together. However if there are other issues in the marriage that aren't sex related it's not a surprise that she doesn't want to fuck, because I wouldn't want to have sex in a relationship that was filled with issues or with someone I wasn't in love with anymore. Talk to her, be gentle and kind, dont be angry or try to guilt trip her, your dick isn't her issue unless she wants it to be. (ps, it probably is not your dick size so dont worry about that, your dick size is probably the least of her problems)