Thanks for your query.Based on the facts that you have posted it appears that you are getting your penis being curved anteriorly on erection.
This is due to what is called as Peyronies disease where there is scarring of the Tunica Albugenia an sheath that covers s erectile tissue
This disparity between dorsal and ventral aspect of Tunica Albugenia results in to bending of penis .
Please consult qualified Urologist
for clinical examination and further treatment.
Normally it gets resolved itself over a period of two years however if you have difficulty in penetrating vagina you may need to get it coorected it by surgery.