Performance anxiety or serious problem ?!

Performance anxiety or serious problem ?

Im a healthy 19 year old male, who recently had sex for the first time
.
Allthought it has happend again since then i havnt yet been able to ejaculate.
I love my girlfriend and i find her beautiful, she makes me erect very easily so there are no problems there.

During the sex both times i wore a extra safe condom which is the thickest one they have, I assumed the reason i didnt finish the first time was because it was so thick and i have problems feeling anything with it on.
Im also a very nervous person by nature and unxeperianced. I used to be liturally sick with nervous when i first went to her house and when she came to mine. But over time i got over that problem and im not as nervous anymore, Im hoping the same will happen with this and that its nothing serious. She is my first proper grlfriend, and she was the first person ive ever had sex with or been naked with.

We have tried oral and hand without the condom on and i still havnt come. I tried going a week without msaterbating to see if it would help, and i got alot of pre-*** but once again i didnt finish. Also she cant grip tight enough or go fast enough to compare to my usual rate when i do it myself with my hand which can sometimes be a problem. And she disliked oral becaue she says she has a small mouth. Ive heard before of alot of guys not finishing often during oral because it makes them self concious.

I dont know that the problem is she turns me on and makes me hard but i still cant finish and i want to for her and for me.I assume its just nerves, and feeling uncomfrotable being naked. I hope its just something like performance anxiety and nerves and not something actually medically wrong with me. I love her alot and i dont want to make her upset or discouraged if she things im not attracted to her or anything cause thats totally not true.

I can ejaculate when i masterbate but from the two times so far not during sex. Is there something wrong with me ? or do you think its just performance anxiety ?.....is there anyway to fix this problem ?
Thanks in advance.

Just nerves... slow down when you do "yourself" and learn to enjoy the feeling when she does you by hand and you will have a happy ending someday soon... !