How do I get messages to send as iMessage it won’t connect to my phone number and I’ve had this phone since March it is now October…

Hi Choas420,

Welcome to the Apple Community.

Re: My phone won’t send iMessages

Wondering if you receive an error message that would point to the cause of the situation.

You might want to check that you are signed in (to your iPhone) with your Apple ID:

How to: Sign in with your Apple ID - Apple Support

Also:

To use iMessage or FaceTime, you need to activate them on your iPhone, iPad, or iPod touch. 

If you can’t turn on or sign in to iMessage or FaceTime - Apple Support

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Re: How do I get messages to send as iMessage

Your iPhone needs a strong wi-fi connection, and the correct settings:

(NB: Messages send over cellular to (non-Apple) Android phones

(and also if wi-fi is not available) and if your carrier plan permits, Charges may apply).

See Apple support's article for details:

What is the difference between iMessage and SMS/MMS? – Apple Support

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Re: it won’t connect to my phone number

How to: Add or remove your phone number in Messages or FaceTime - Apple Support

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More info:

If you have recently changed your Apple ID or Apple ID password:

What to do after you've changed your Apple ID or password – Apple Support

More support:

If needed, you can contact Apple Messages Support Team:

There is a "Get Support" link at bottom right on the webpage that opens from the link below.

Messages for iPhone, iPad, Apple Watch, and Mac - Official Apple Support

All the best :-)