मेरी ऊर्जा कम है।

Because मेरा / मेरी / मेरे agrees with the noun that follows, not with the gender of the speaker.

Here, the noun is ऊर्जा, and ऊर्जा is feminine singular, so the correct form is मेरी.

So:

• मेरी ऊर्जा = my energy

Even if a man is speaking, he still says मेरी ऊर्जा, because ऊर्जा is feminine.

ऊर्जा means energy.

It is a perfectly normal Hindi word, but it can sound a little more formal or standard than everyday casual speech. In conversation, people may also say:

• एनर्जी for energy
• ताकत for strength, depending on the meaning

So मेरी ऊर्जा कम है is correct, but in very casual speech you may hear alternatives.

कम means less, low, or not much.

है means is.

So:

• ऊर्जा कम है = energy is low / there is little energy

In this sentence, कम is describing the amount or level of energy.

Hindi often does not use a direct equivalent of English have in sentences like this.

Instead of saying I have low energy, Hindi naturally says something closer to:

• My energy is low

So मेरी ऊर्जा कम है is a very normal Hindi way to express that idea.

Yes. It is correct and natural, especially in neutral or slightly formal Hindi.

In everyday conversation, you might also hear:

• मेरी एनर्जी कम है।
• आज मुझमें ऊर्जा कम है।
• मुझमें ताकत कम है।

These all express a similar idea, but the tone changes a little:

• ऊर्जा sounds more standard
• एनर्जी sounds more colloquial
• ताकत focuses more on physical strength

No, that is not natural Hindi.

The problem is that कम is describing ऊर्जा, not मैं. The sentence is about your energy level, not about what you are.

Use:

• मेरी ऊर्जा कम है।
• मुझमें ऊर्जा कम है।

Those are natural ways to say that your energy is low.

The pattern is:

मेरी + ऊर्जा + कम + है

Word-for-word, that is:

• my
• energy
• low
• is

This kind of order is very common in Hindi: first the noun phrase, then the description, then है.

A simple transliteration is:

merī ūrjā kam hai

A rough pronunciation guide:

• मेरी ≈ may-ree
• ऊर्जा ≈ oor-jaa
• कम ≈ kum
• है ≈ heh or hai, depending on accent

So the full sentence is roughly:

may-ree oor-jaa kum hai

Because कम is the normal Hindi word for low when you mean small amount, reduced level, or not much.

So for things like:

• energy
• time
• money
• water
• interest

Hindi often uses कम.

Words like नीचा / नीचे are usually about physical position, not amount. So कम is the right choice in मेरी ऊर्जा कम है.