You have a solid GPA for an Engineering student. Remember, it's your overall OML, as pointed out above, and there are many ways to improve this.
However, the only things to better your chances for getting your #1 choice of Branches, whether it's Infantry or something else, is to first, show a true interest in the Branch, get "Most Preferred", and finally Bradso for that Branch. Getting a solid recommendation from your PMS on your evaluation will help, too.
There are cadets from all across the OML scores that received their #1 picks. They did the above.
On the flip side, there are cadets who simply felt they had a strong enough OML (Top 20%) who did not Bradso and were upset they did not get their #1.
When it's your time to pick your Branch choices, don't expect to get your #1 pick without doing the above, no matter what your GPA is.